2.3.0 (2025-09-15)
------------------

General
^^^^^^^

- The minimum required NumPy is now 1.25. [#2043]

- The minimum required SciPy is now 1.11.1. [#2043]

- The minimum required Matplotlib is now 3.8. [#2043]

- The minimum required scikit-image is now 0.21. [#2043]

New Features
^^^^^^^^^^^^

- ``photutils.isophote``

  - ``build_ellipse_model`` is now Cythonized and considerably faster.
    [#2046]

  - ``build_ellipse_model`` also has an additional optional keyword
    argument ``sma_interval``, which was previously hardcoded. [#2046]

- ``photutils.psf``

  - ``PSFPhotometry`` and ``IterativePSFPhotometry`` now raise an error
    if the input ``error`` array contains non-finite or zero values.
    [#2022]

  - ``GriddedPSFModel`` can now be used with a single input ePSF model,
    which will be equivalent to ``ImagePSF``. [#2034]

  - The ``finder`` callable input to ``PSFPhotometry`` and
    ``IterativePSFPhotometry`` is no longer restricted to have x and y
    column names of ``'xcentroid'`` and ``'ycentroid'``. The allowed
    column names are now the same as those allowed in the
    ``init_params`` table. [#2072]

  - Added a ``group_warning_threshold`` keyword to ``PSFPhotometry`` and
    ``IterativePSFPhotometry``. [#2081]

  - The ``PSFPhotometry`` and ``IterativePSFPhotometry`` classes no
    longer fail for invalid sources, defined as those that have no
    overlap with the input data, are completely masked, or have too few
    unmasked pixels for a fit.  These classes have new flags (64, 128,
    256, respectively) for these invalid conditions. [#2084, #2085]

  - The ``PSFPhotometry`` and ``IterativePSFPhotometry`` classes have
    new ``results_to_init_params`` and ``results_to_model_params``
    methods for outputting fit results in different formats. [#2084]

  - When using Astropy 7.0+, the ``PSFPhotometry`` and
    ``IterativePSFPhotometry`` ``fitter`` object now modifies the PSF
    model in place instead of creating a copy, improving performance and
    significantly reducing memory usage in some cases. [#2093]

  - ``PSFPhotometry`` and ``IterativePSFPhotometry`` now return a
    reduced chi-squared statistic (``reduced_chi2`` column in the
    results table). [#2086]

  - The PSF photometry classes now use a dynamically generated "flat"
    model instead of a compound model for grouped sources. This
    eliminates recursion limits and significantly reduces memory usage
    for large groups. [#2100]

- ``photutils.segmentation``

  - An optional ``array`` keyword was added to the ``SourceCatalog``
    ``make_cutouts`` method. [#2023]

  - Added a ``group`` keyword to the ``SegmentationImage``
    ``to_regions`` method. [#2060, #2065]

  - Added a ``decode_psf_flags`` utility function for decoding PSF
    photometry bit flags. [#2090]

  - Added a ``PSF_FLAGS`` object to hold all PSF photometry bit flags in
    one place. PSF_FLAGS provides readable, named constants for each bit
    flag and helper utilities for decoding bit flags. [#2091]

Bug Fixes
^^^^^^^^^

- ``photutils.centroids``

  - Fixed an issue with the initial Gaussian theta units in
    ``centroid_2dg``. [#2013]

  - Fixed a corner-case issue where zero-sum arrays with ndim > 2 input
    to ``centroid_com`` would return only two np.nan coordinates instead
    of matching the dimensionality of the input array. [#2045]

- ``photutils.datasets``

  - Fixed a bug in ``make_model_image`` where the output image would not
    have units in the case where the input params had units and none
    of the models overlapped the image shape. [#2082]

  - Fixed a bug in ``make_model_image`` where an error would be raised
    if any row in the input parameters table contained non-finite model
    parameters. Such sources are now silently ignored. [#2083]

- ``photutils.psf``

  - Fixed a bug in ``fit_2dgaussian`` and ``fit_fwhm`` where the fit
    would fail if there were NaN values in the input data. [#2030]

  - Fixed the check in ``GriddedPSFModel`` for rectangular pixel grids.
    [#2035]

  - Fixed a bug in ``PSFPhotometry`` where the ``'group_id'`` column
    would be ignored if included in the ``init_params`` table. [#2070]

  - Fixed a bug in ``PSFPhotometry`` where the output ``flux_err``
    column would not have units if the input data had units and the flux
    model parameter was fixed in value. [#2072]

  - Fixed a bug in ``PSFPhotometry`` and ``IterativePSFPhotometry``
    where an error would be raised if the x or y columns in
    ``init_params`` had units. [#2079]

  - Fixed a bug in ``PSFPhotometry`` and ``IterativePSFPhotometry`` for
    the boundary conditions where flag=2 would be set. [#2080]

  - Fixed a bug in ``EPSFBuilder`` where the output PSF would have the
    wrong shape if the input ``stars`` were non-square cutouts. [#2089,
    #2092]

  - Fixed a bug in the calculation of the ``PSFPhotometry`` and
    ``IterativePSFPhotometry`` ``qfit`` and ``cfit`` to not include the
    fit weights. [#2099]

- ``photutils.segmentation``

  - Fixed an issue where a newly-defined extra property of a
    ``SourceCatalog`` with ``overwrite=True`` would not be added to
    the ``extra_properties`` attribute. [#2039]

  - Fixed an issue where the ``SegmentationImage`` ``segments``
    attribute would fail if any source segment was non-contiguous.
    [#2060]

API Changes
^^^^^^^^^^^

- ``photutils.background``

  - An explicit ``ValueError`` is now raised if the input ``data`` to
    ``Background2D`` contains all non-finite values. [#2062]

- ``photutils.psf``

  - The ``GriddedPSFModel`` ``data`` and ``grid_xypos`` attributes are
    now read-only. [#2036]

  - The ``PSFPhotometry`` ``fit_param`` attribute is now deprecated. Use
    the new ``results_to_init_params`` method instead. [#2084]

  - The deprecated ``PSFPhotometry`` ``fit_results`` attribute has been
    removed. [#2084]

- ``photutils.segmentation``

  - The ``SegmentationImage`` ``polygons`` list may now include either
    Shapely ``Polygon`` or ``MultiPolygon`` (non-contiguous) objects.
    [#2060]

  - The ``SegmentationImage`` ``to_patches`` and ``plot_patches``
    methods now return ``matplotlib.patches.PathPatch`` objects. [#2060]

  - The ``SegmentationImage`` ``to_regions`` method now returns
    ``PolygonPixelRegion`` regions that have the segment label stored in
    the object ``meta`` dictionary. [#2060]


2.2.0 (2025-02-18)
------------------

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - Add an ``aperture_to_region`` function to convert an Aperture object
    to an astropy ``Region`` or ``Regions`` object. [#2009]

- ``photutils.profiles``

  - Added ``data_radius`` and ``data_profile`` attributes to the
    ``RadialProfile`` class for calculating the raw radial profile.
    [#2001]

- ``photutils.segmentation``

  - Added a ``to_regions`` method to ``SegmentationImage`` that converts
    the segment outlines to a ``regions.Regions`` object. [#2010]

Bug Fixes
^^^^^^^^^

- ``photutils.segmentation``

  - Fixed an issue where the ``SegmentationImage`` ``polygons``
    attribute would raise an error if any source segment contained a
    hole. [#2005]

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - The ``theta`` attribute of ``EllipticalAperture``,
    ``EllipticalAnnulus``, ``RectangularAperture``, and
    ``RectangularAnnulus`` is now always returned as an angular
    ``Quantity``. [#2008]


2.1.0 (2025-01-06)
------------------

General
^^^^^^^

- The minimum required Python is now 3.11. [#1958]

- The minimum required gwcs is now 0.20. [#1961]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - The ``aperture_photometry`` output table will now include a
    ``sky_center`` column if ``wcs`` is input, even if the input aperture
    is not a sky aperture. [#1965]

- ``photutils.datasets``

  - A ``params_map`` keyword was added to ``make_model_image`` to allow
    a custom mapping between model parameter names and column names in
    the parameter table. [#1994]

- ``photutils.detection``

  - The ``find_peaks`` ``border_width`` keyword can now accept two
    values, indicating the border width along the y and x edges,
    respectively. [#1957]

- ``photutils.morphology``

  - An optional ``mask`` keyword was added to the ``gini`` function.
    [#1979]

- ``photutils.segmentation``

  - Added ``deblended_labels``, ``deblended_labels_map``, and
    ``deblended_labels_inverse_map`` properties to ``SegmentationImage``
    to identify and map any deblended labels. [#1988]

Bug Fixes
^^^^^^^^^

- ``photutils.segmentation``

  - Fixed a bug where the table output from the ``SourceCatalog``
    ``to_table`` method could have column names with a ``np.str_``
    representation instead of ``str`` representation when using NumPy
    2.0+. [#1956]

  - Fixed a bug to ensure that the dtype of the ``SegmentationImage``
    ``labels`` always matches the image dtype. [#1986]

  - Fixed an issue with the source labels after source deblending when
    using ``relabel=False``. [#1988]

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - The ``xcenter`` and ``ycenter`` columns in the table returned by
    ``aperture_photometry`` no longer have (pixel) units for consistency
    with other tools. [#1993]

- ``photutils.detection``

  - When ``exclude_border`` is set to ``True`` in the ``DAOStarFinder``
    and ``StarFinder`` classes, the excluded border region can be
    different along the x and y edges if the kernel shape is rectangular.
    [#1957]

  - Detected sources that match interval ends for sharpness, roundness, and
    maximum peak values (``sharplo``, ``sharphi``, ``roundlo``, ``roundhi``,
    and ``peakmax``) are now included in the returned table of detected
    sources by ``DAOStarFinder`` and ``IRAFStarFinder``. [#1978]

  - Detected sources that match the maximum peak value (``peakmax``)
    are now included in the returned table of detected sources by
    ``StarFinder``. [#1990]

- ``photutils.morphology``

  - The ``gini`` function now returns zero instead of NaN if the
    (unmasked) data values sum to zero. [#1979]

- ``photutils.psf``

  - The ``'viridis'`` color map is now the default in the
    ``GriddedPSFModel`` ``plot_grid`` method when ``deltas=True``.
    [#1954]

  - The ``GriddedPSFModel`` ``plot_grid`` color bar now matches the
    height of the displayed image. [#1955]


2.0.2 (2024-10-24)
------------------

Bug Fixes
^^^^^^^^^

- Due to an upstream bug in ``bottleneck`` with ``float32`` arrays,
  ``bottleneck`` nan-functions are now used internally only for
  ``float64`` arrays. Performance may be impacted for computations
  involving arrays with dtype other than ``float64``. Affected functions
  are used in the ``aperture``, ``background``, ``detection``,
  ``profiles``, ``psf``, and ``segmentation`` subpackages. This change
  has no impact if ``bottleneck`` is not installed.

- ``photutils.background``

  - Fixed a bug in ``Background2D`` where an error would be raised
    when using the ``BkgIDWInterpolator`` interpolator when any mesh was
    excluded, e.g., due to an input mask. [#1940]

- ``photutils.detection``

  - Fixed a bug in the star finders (``DAOStarFinder``,
    ``IRAFStarFinder``, and ``StarFinder``) when
    ``exclude_border=True``. Also, fixed an issue with
    ``exclude_border=True`` where if all sources were in the border
    region then an error would be raised. [#1943]


2.0.1 (2024-10-16)
------------------

Bug Fixes
^^^^^^^^^

- ``photutils.background``

  - Fixed a bug in ``SExtractorBackground`` where the dimensionality of
    the returned value would not be preserved if the output was a single
    value. [#1934]

  - Fixed an issue in ``Background2D`` where if the ``box_size`` equals
    the input array shape the input data array could be modified. [#1935]


2.0.0 (2024-10-14)
------------------

General
^^^^^^^

- The ``regions`` package is now an optional dependency. [#1813]

- The minimum required Astropy is now 5.3. [#1839]

- SciPy is now a required dependency. [#1880]

- The minimum required SciPy is now 1.10. [#1880]

- The minimum required NumPy is now 1.24. [#1881]

- The minimum required Matplotlib is now 3.7. [#1881]

- The minimum required GWCS is now 0.19. [#1881]

- Importing tools from all subpackages now requires including the
  subpackage name. Also, PSF matching tools must now be imported from
  ``photutils.psf.matching`` instead of ``photutils.psf``. [#1879, #1904]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - The metadata in the tables generated by ``aperture_photometry`` and
    ``ApertureStats`` now include the aperture name and shape
    parameters. [#1849]

  - ``aperture_photometry`` and ``ApertureStats`` now accept supported
    ``regions.Region`` objects, i.e., those corresponding to circular,
    elliptical, and rectangular apertures. [#1813, #1852]

  - A new ``region_to_aperture`` convenience function has been added to
    convert supported ``regions.Region`` objects to ``Aperture`` objects.
    [#1813, #1852]

- ``photutils.background``

  - The ``Background2D`` class has been refactored to significantly
    reduce its memory usage. In some cases, it is also significantly
    faster. [#1870, #1872, #1873]

  - A new ``npixels_mesh`` property was added to ``Background2D``
    that gives a 2D array of the number of pixels used to compute the
    statistics in the low-resolution grid. [#1870]

  - A new ``npixels_map`` property was added to ``Background2D``
    that gives a 2D array of the number of pixels used to compute the
    statistics in each mesh, resized to the shape of the input data.
    [#1871]

- ``photutils.centroids``

  - ``Quantity`` arrays can now be input to ``centroid_1dg`` and
    ``centroid_2dg``. [#1861]

- ``photutils.datasets``

  - Added a new ``params_table_to_models`` function to create a list of
    models from a table of model parameters. [#1896]

- ``photutils.psf``

  - Added new ``xy_bounds`` keyword to ``PSFPhotometry`` and
    ``IterativePSFPhotometry`` to allow one to bound the x and y
    model parameters during the fitting. [#1805]

  - The ``extract_stars`` function can now accept ``NDData`` inputs with
    uncertainty types other than ``weights``. [#1821]

  - Added new ``GaussianPSF``, ``CircularGaussianPSF``, ``GaussianPRF``,
    ``CircularGaussianPRF``, and ``MoffatPSF`` PSF model classes.
    [#1838, #1898, #1918]

  - Added new ``AiryDiskPSF`` PSF model class. [#1843, #1918]

  - Added new ``CircularGaussianSigmaPRF`` PSF model class. [#1845,
    #1918]

  - The ``IntegratedGaussianPRF`` model now supports units. [#1838]

  - A new ``results`` attribute was added to ``PSFPhotometry`` to store
    the returned table of fit results. [#1858]

  - Added new ``fit_fwhm`` convenience function to estimate the FWHM of
    one or more sources in an image by fitting a circular 2D Gaussian PSF
    model. [#1859, #1887, #1899, #1918]

  - Added new ``fit_2dgaussian`` convenience function to fit a circular
    2D Gaussian PSF to one or more sources in an image. [#1859, #1887,
    #1899]

  - Added new ``ImagePSF`` model class to represent a PSF model as an
    image. [#1890]

  - The ``GriddedPSFModel`` model now has a ``bounding_box`` method to
    return the bounding box of the model. [#1891]

  - The ``GriddedPSFModel`` class has been refactored to significantly
    improve its performance. In typical PSF photometry use cases, it is
    now about 4 times faster than previous versions. [#1903]

- ``photutils.segmentation``

  - Reduced the memory usage and improved the performance of source
    deblending with ``deblend_sources`` and ``SourceFinder``. [#1924,
    #1925, #1926]

  - Improved the accuracy of the progress bar in ``deblend_sources`` and
    ``SourceFinder`` when using multiprocessing. Also added the source
    ID label number to the progress bar. [#1925, #1926]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed a bug checking that the ``subpixels`` keyword is a strictly
    positive integer. [#1816]

- ``photutils.datasets``

  - Fixed an issue in ``make_model_image`` where if the ``bbox_factor``
    was input and the model bounding box did not have a ``factor`` keyword
    then an error would be raised. [#1921]

- ``photutils.detection``

  - Fixed an issue where ``DAOStarFinder`` would not return any sources
    if the input ``threshold`` was set to zero due to the ``flux`` being
    non-finite. [#1882]

- ``photutils.isophote``

  - Fixed a bug in ``build_ellipse_model`` where if
    ``high_harmonics=True``, the harmonics were not correctly added to
    the model. [#1810]

- ``photutils.psf``

  - Fixed a bug in ``make_psf_model`` where if the input model had
    amplitude units, an error would be raised. [#1894]

API Changes
^^^^^^^^^^^

- The ``sklearn`` version information has been removed from the meta
  attribute in output tables. ``sklearn`` was removed as an optional
  dependency in 1.13.0. [#1807]

- ``photutils.background``

  - The ``Background2D`` ``background_mesh`` and ``background_rms_mesh``
    properties will have units if the input data has units. [#1870]

  - The ``Background2D`` ``edge_method`` keyword is now deprecated.
    When ``edge_method`` is eventually removed, the ``'pad'`` option
    will always be used. [#1870]

  - The ``Background2D`` ``background_mesh_masked``,
    ``background_rms_mesh_masked``, and ``mesh_nmasked`` properties are
    now deprecated. [#1870]

  - To reduce memory usage, ``Background2D`` no longer keeps a cached
    copy of the returned ``background`` and ``background_rms`` properties.
    [#1870]

  - The ``Background2D`` ``data``, ``mask``, ``total_mask``, ``nboxes``,
    ``box_npixels``, and ``nboxes_tot`` attributes have been removed.
    [#1870]

  - The ``BkgZoomInterpolator`` ``grid_mode`` keyword is now deprecated.
    When ``grid_mode`` is eventually removed, the `True` option will
    always be used. [#1870]

  - The ``Background2D`` ``background``, ``background_rms``,
    ``background_mesh``, and ``background_rms_mesh`` properties now have
    the same ``dtype`` as the input data. [#1922]

- ``photutils.centroids``

  - For consistency with other fitting functions (including PSF
    fitting), the ``centroid_1dg`` and ``centroid_2dg`` functions
    now fit only a 1D or 2D Gaussian model, respectively, excluding
    any constant component. The input data are required to be
    background-subtracted. [#1861]

  - The fitter used in ``centroid_1dg`` and ``centroid_2dg`` was changed
    from ``LevMarLSQFitter`` to ``TRFLSQFitter``. ``LevMarLSQFitter`` uses
    the legacy SciPy function ``scipy.optimize.leastsq``, which is no
    longer recommended. [#1917]

- ``photutils.datasets``

  - The deprecated ``make`` module has been removed. Instead of
    importing functions from ``photutils.datasets.make``, import
    functions from ``photutils.datasets``. [#1884]

  - The deprecated ``make_model_sources_image``,
    ``make_gaussian_prf_sources_image``, ``make_gaussian_sources_table``,
    ``make_test_psf_data``, ``make_random_gaussians_table``, and
    ``make_imagehdu`` functions have been removed. [#1884]

- ``photutils.detection``

  - The deprecated ``sky`` keyword in ``DAOStarFinder`` and
    ``IRAFStarFinder`` has been removed. Also, there will no longer be a
    ``sky`` column in the output table. [#1884]

  - The ``DAOStarFinder`` ``flux`` and ``mag`` columns were changed
    to give sensible values. Previously, the ``flux`` value was defined
    by the original DAOFIND algorithm as a measure of the intensity
    ratio of the amplitude of the best fitting Gaussian function at the
    object position to the detection threshold. A ``daofind_mag`` column
    was added for comparison to the original IRAF DAOFIND algorithm.
    [#1885]

- ``photutils.isophote``

  - The ``build_ellipse_model`` function now raises a ``ValueError`` if
    the input ``isolist`` is empty. [#1809]

- ``photutils.profiles``

  - The fitter used in ``RadialProfile`` to fit the profile
    with a Gaussian was changed from ``LevMarLSQFitter`` to
    ``TRFLSQFitter``. ``LevMarLSQFitter`` uses the legacy SciPy function
    ``scipy.optimize.leastsq``, which is no longer recommended. [#1899]

- ``photutils.psf``

  - The ``IntegratedGaussianPRF`` class now must be initialized using
    keyword-only arguments. [#1838]

  - The ``IntegratedGaussianPRF`` class has been moved to the new
    ``functional_models`` module. [#1838]

  - The ``models`` and ``griddedpsfmodel`` modules have been renamed to
    ``image_models`` and ``gridded_models``, respectively. [#1838]

  - The ``IntegratedGaussianPRF`` model class has been renamed to
    ``CircularGaussianPRF``. ``IntegratedGaussianPRF`` is now
    deprecated. [#1845]

  - Some PSF tools have moved to new modules. The ``PRFAdapter``
    class and the ``make_psf_model`` and ``grid_from_epsfs``
    functions have been moved to the new ``model_helpers`` module.
    The ``make_psf_model_image`` function has been moved to the new
    ``simulations`` module. It is recommended that all of these tools be
    imported from ``photutils.psf`` without using the submodule name.
    [#1854, #1901]

  - The ``PSFPhotometry`` ``fit_results`` attribute has been renamed to
    ``fit_info``. ``fit_results`` is now deprecated. [#1858]

  - The ``PRFAdapter`` class has been deprecated. Instead, use a
    ``ImagePSF`` model derived from the ``discretize_model`` function in
    ``astropy.convolution``. [#1865]

  - The ``FittableImageModel`` and ``EPSFModel`` classes have been
    deprecated. Instead, use the new ``ImagePSF`` model class. [#1890]

  - The default fitter for ``PSFPhotometry``,
    ``IterativePSFPhotometry``, and ``EPSFFitter`` was changed from
    ``LevMarLSQFitter`` to ``TRFLSQFitter``. ``LevMarLSQFitter`` uses
    the legacy SciPy function ``scipy.optimize.leastsq``, which is no
    longer recommended. [#1899]

  - ``psf_shape`` is now an optional keyword in the ``make_model_image``
    and ``make_residual_image`` methods of ``PSFPhotometry`` and
    ``IterativePSFPhotometry``. The value defaults to using the model
    bounding box to define the shape and is required only if the PSF
    model does not have a bounding box attribute. [#1921]

- ``photutils.psf.matching``

  - PSF matching tools must now be imported from
    ``photutils.psf.matching`` instead of ``photutils.psf``. [#1904]

- ``photutils.segmentation``

  - The ``SegmentationImage`` ``relabel_consecutive``,
    ``resassign_label(s)``, ``keep_label(s)``, ``remove_label(s)``,
    ``remove_border_labels``, and ``remove_masked_labels`` methods now
    keep the original dtype of the segmentation image instead of always
    changing it to ``int`` (``int64``). [#1878, #1923]

  - The ``detect_sources`` and ``deblend_sources`` functions now return
    a ``SegmentationImage`` instance whose data dtype is ``np.int32``
    instead of ``int`` (``int64``) unless more than (2**32 - 1) labels
    are needed. [#1878]


1.13.0 (2024-06-28)
-------------------

General
^^^^^^^

- ``scikit-learn`` has been removed as an optional dependency. [#1774]

New Features
^^^^^^^^^^^^

- ``photutils.datasets``

  - Added a ``make_model_image`` function for generating simulated images
    with model sources. This function has more options
    and is significantly faster than the now-deprecated
    ``make_model_sources_image`` function. [#1759, #1790]

  - Added a ``make_model_params`` function to make a table of randomly
    generated model positions, fluxes, or other parameters for simulated
    sources. [#1766, #1796]

- ``photutils.detection``

  - The ``find_peaks`` function now supports input arrays with units.
    [#1743]

  - The ``Table`` returned from ``find_peaks`` now has an ``id`` column
    that contains unique integer IDs for each peak. [#1743]

  - The ``DAOStarFinder``, ``IRAFStarFinder``, and ``StarFinder``
    classes now support input arrays with units. [#1746]

- ``photutils.profiles``

  - Added an ``unnormalize`` method to ``RadialProfile`` and
    ``CurveOfGrowth`` to return the profile to the state before any
    ``normalize`` calls were run. [#1732]

  - Added ``calc_ee_from_radius`` and ``calc_radius_from_ee`` methods to
    ``CurveOfGrowth``. [#1733]

- ``photutils.psf``

  - Added an ``include_localbkg`` keyword to the ``IterativePSFPhotometry``
    ``make_model_image`` and ``make_residual_image`` methods. [#1756]

  - Added "x_fit", "xfit", "y_fit", "yfit", "flux_fit", and "fluxfit" as
    allowed column names in the ``init_params`` table input to the PSF
    photometry objects. [#1765]

  - Added a ``make_psf_model_image`` function to generate a simulated
    image from PSF models. [#1785, #1796]

  - ``PSFPhotometry`` now has a new ``fit_params`` attribute containing
    a table of the fit model parameters and errors. [#1789]

  - The ``PSFPhotometry`` and ``IterativePSFPhotometry`` ``init_params``
    table now allows the user to input columns for model parameters
    other than x, y, and flux. The column names must match the parameter
    names in the PSF model. They can also be suffixed with either the
    "_init" or "_fit" suffix. [#1793]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed an issue in ``ApertureStats`` where in very rare cases the
    ``covariance`` calculation could take a long time. [#1788]

- ``photutils.background``

  - No longer warn about NaNs in the data if those NaNs are masked in
    ``coverage_mask`` passed to ``Background2D``. [#1729]

- ``photutils.psf``

  - Fixed an issue where ``IterativePSFPhotometry`` would fail if the
    input data was a ``Quantity`` array. [#1746]

  - Fixed the ``IntegratedGaussianPRF`` class ``bounding_box`` limits to
    always be symmetric. [#1754]

  - Fixed an issue where ``IterativePSFPhotometry`` could sometimes
    issue a warning when merging tables if ``mode='all'``. [#1761]

  - Fixed a bug where the first matching column in the ``init_params``
    table was not used in ``PSFPhotometry`` and
    ``IterativePSFPhotometry``. [#1765]

  - Fixed an issue where ``IterativePSFPhotometry`` could sometimes
    raise an error about non-overlapping data. [#1778]

  - Fixed an issue with unit handling in ``PSFPhotometry`` and
    ``IterativePSFPhotometry``. [#1792]

  - Fixed an issue in ``IterativePSFPhotometry`` where the
    ``fit_results`` attribute was not cleared between repeated calls.
    [#1793]

- ``photutils.segmentation``

  - Fixed an issue in ``SourceCatalog`` where in very rare cases the
    ``covariance`` calculation could take a long time. [#1788]

API Changes
^^^^^^^^^^^

- The ``photutils.test`` function has been removed. Instead use the
  ``pytest --pyargs photutils`` command. [#1725]

- ``photutils.datasets``

  - The ``photutils.datasets`` subpackage has been reorganized and
    the ``make`` module has been deprecated. Instead of importing
    functions from ``photutils.datasets.make``, import functions from
    ``photutils.datasets``. [#1726]

  - The ``make_model_sources_image`` function has been deprecated in
    favor of the new ``make_model_image`` function. The new function
    has more options and is significantly faster. [#1759]

  - The randomly-generated optional noise in the simulated example images
    ``make_4gaussians_image`` and ``make_100gaussians_image`` is now
    slightly different. The noise sigma is the same, but the pixel
    values differ. [#1760]

  - The ``make_gaussian_prf_sources_image`` function is now
    deprecated. Use the ``make_model_psf_image`` function or the new
    ``make_model_image`` function instead. [#1762]

  - The ``make_gaussian_sources_table`` function now includes an "id"
    column and always returns both ``'flux'`` and ``'amplitude'`` columns.
    [#1763]

  - The ``make_model_sources_table`` function now includes an "id"
    column. [#1764]

  - The ``make_gaussian_sources_table`` function is now deprecated.
    Use the ``make_model_sources_table`` function instead. [#1764]

  - The ``make_test_psf_data`` function is now deprecated. Use the new
    ``make_model_psf_image`` function instead. [#1785]

- ``photutils.detection``

  - The ``sky`` keyword in ``DAOStarFinder`` and ``IRAFStarFinder`` is
    now deprecated and will be removed in a future version. [#1747]

  - Sources that have non-finite properties (e.g., centroid, roundness,
    sharpness, etc.) are automatically excluded from the output table in
    ``DAOStarFinder``, ``IRAFStarFinder``, and ``StarFinder``. [#1750]

- ``photutils.psf``

  - ``PSFPhotometry`` and ``IterativePSFPhotometry`` now raise a
    ``ValueError`` if the input ``psf_model`` is not two-dimensional
    with ``n_inputs=2`` and ``n_outputs=1``. [#1741]

  - The ``IntegratedGaussianPRF`` class ``bounding_box`` is now a method
    instead of an attribute for consistency with Astropy models. The
    method has a ``factor`` keyword to scale the bounding box. The
    default scale factor is 5.5 times ``sigma``. [#1754]

  - The ``IterativePSFPhotometry`` ``make_model_image`` and
    ``make_residual_image`` methods no longer include the local
    background by default. This is a backwards-incompatible change. If
    the previous behavior is desired, set ``include_localbkg=True``.
    [#1756]

  - ``IterativePSFPhotometry`` will now only issue warnings after
    all iterations are completed. [#1767]

  - The ``IterativePSFPhotometry`` ``psfphot`` attribute has been
    removed. Instead, use the ``fit_results`` attribute, which contains
    a list of ``PSFPhotometry`` instances for each fit iteration.
    [#1771]

  - The ``group_size`` column has been moved to come immediately after
    the ``group_id`` column in the output table from ``PSFPhotometry``
    and ``IterativePSFPhotometry``. [#1772]

  - The ``PSFPhotometry`` ``init_params`` table was moved from the
    ``fit_results`` dictionary to an attribute. [#1773]

  - Removed  ``local_bkg``, ``psfcenter_indices``, ``fit_residuals``,
    ``npixfit``, and ``nmodels`` keys from the ``PSFPhotometry``
    ``fit_results`` dictionary. [#1773]

  - Removed the deprecated ``BasicPSFPhotometry``,
    ``IterativelySubtractedPSFPhotometry``, ``DAOPhotPSFPhotometry``,
    ``DAOGroup``, ``DBSCANGroup``, and ``GroupStarsBase``, and
    ``NonNormalizable`` classes and the ``prepare_psf_model``,
    ``get_grouped_psf_model``, and ``subtract_psf`` functions. [#1774]

  - A ``ValueError`` is now raised if the shape of the ``error`` array
    does not match the ``data`` array when calling the PSF-fitting
    classes. [#1777]

  - The ``fit_param_errs`` key was removed from the ``PSFPhotometry``
    ``fit_results`` dictionary. The fit parameter errors are now stored
    in the ``fit_params`` table. [#1789]

  - The ``cfit`` column in the ``PSFPhotometry`` and
    ``IterativePSFPhotometry`` result table will now be NaN for sources
    whose initial central pixel is masked. [#1789]


1.12.0 (2024-04-12)
-------------------

General
^^^^^^^

- The minimum required Python is now 3.10. [#1719]

- The minimum required NumPy is now 1.23. [#1719]

- The minimum required SciPy is now 1.8. [#1719]

- The minimum required scikit-image is now 0.20. [#1719]

- The minimum required scikit-learn is now 1.1. [#1719]

- The minimum required pytest-astropy is now 0.11. [#1719]

- The minimum required sphinx-astropy is now 1.9. [#1719]

- NumPy 2.0 is supported.

Bug Fixes
^^^^^^^^^

- ``photutils.background``

  - No longer warn about NaNs in the data if those NaNs are masked in
    ``mask`` passed to ``Background2D``. [#1712]

API Changes
^^^^^^^^^^^

- ``photutils.utils``

  - The default value for the ``ImageDepth`` ``mask_pad`` keyword is now
    set to 0. [#1714]


1.11.0 (2024-02-16)
-------------------

New Features
^^^^^^^^^^^^

- ``photutils.psf``

  - An ``init_params`` table is now included in the ``PSFPhotometry``
    ``fit_results`` dictionary. [#1681]

  - Added an ``include_localbkg`` keyword to the ``PSFPhotometry``
    ``make_model_image`` and ``make_residual_image`` methods. [#1691]

  - Significantly reduced the memory usage of PSF photometry when using
    a ``GriddedPSFModel`` PSF model. [#1679]

  - Added a ``mode`` keyword to ``IterativePSFPhotometry`` for
    controlling the fitting mode. [#1708]

- ``photutils.datasets``

  - Improved the performance of ``make_test_psf_data`` when generating
    random coordinates with a minimum separation. [#1668]

- ``photutils.segmentation``

  - The ``SourceFinder`` ``npixels`` keyword can now be a tuple
    corresponding to the values used for the source finder and source
    deblender, respectively. [#1688]

- ``photutils.utils``

  - Improved the performance of ``ImageDepth`` when generating
    random coordinates with a minimum separation. [#1668]

Bug Fixes
^^^^^^^^^

- ``photutils.psf``

  - Fixed an issue where PSF models produced by ``make_psf_model`` would
    raise an error with ``PSFPhotometry`` if the fit did not converge.
    [#1672]

  - Fixed an issue where ``GriddedPSFModel`` fixed model parameters were
    not respected when copying the model or fitting with the PSF
    photometry classes. [#1679]

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - ``PixelAperture`` instances now raise an informative error message
    when ``positions`` is input as a ``zip`` object containing Astropy
    ``Quantity`` objects. [#1682]

- ``photutils.psf``

  - The ``GridddedPSFModel`` string representations now include the
    model ``flux``, ``x_0``, and ``y_0`` parameters. [#1680]

  - The ``PSFPhotometry`` ``make_model_image`` and ``make_residual_image``
    methods no longer include the local background by default. This is a
    backwards-incompatible change. If the previous behavior is desired,
    set ``include_localbkg=True``. [#1703]

  - The PSF photometry ``finder_results`` attribute is now returned as a
    ``QTable`` instead of a list of ``QTable``. [#1704]

  - Deprecated the ``NonNormalizable`` custom warning class in favor of
    ``AstropyUserWarning``. [#1710]

- ``photutils.segmentation``

  - The ``SourceCatalog`` ``get_label`` and ``get_labels`` methods now
    raise a ``ValueError`` if any of the input labels are invalid. [#1694]


1.10.0 (2023-11-21)
-------------------

General
^^^^^^^

- The minimum required Astropy is now 5.1. [#1627]

New Features
^^^^^^^^^^^^

- ``photutils.datasets``

  - Added a ``border_size`` keyword to ``make_test_psf_data``. [#1665]

  - Improved the generation of random PSF positions in
    ``make_test_psf_data``. [#1665]

- ``photutils.detection``

  - Added a ``min_separation`` keyword to ``DAOStarFinder`` and
    ``IRAFStarFinder``. [#1663]

- ``photutils.morphology``

  - Added a ``wcs`` keyword to ``data_properties``. [#1648]

- ``photutils.psf``

  - The ``GriddedPSFModel`` ``plot_grid`` method now returns a
    ``matplotlib.figure.Figure`` object. [#1653]

  - Added the ability for the ``GriddedPSFModel`` ``read`` method to
    read FITS files generated by WebbPSF. [#1654]

  - Added "flux_0" and "flux0" as allowed flux column names in the
    ``init_params`` table input to the PSF photometry objects. [#1656]

  - PSF models output from ``prepare_psf_model`` can now be input into
    the PSF photometry classes. [#1657]

  - Added ``make_psf_model`` function for making a PSF model from a
    2D Astropy model. Compound models are also supported. [#1658]

  - The ``GriddedPSFModel`` oversampling can now be different in the x
    and y directions. The ``oversampling`` attribute is now stored as
    a 1D ``numpy.ndarray`` with two elements. [#1664]

- ``photutils.segmentation``

  - The ``SegmentationImage`` ``make_source_mask`` method now uses a
    much faster implementation of binary dilation. [#1638]

  - Added a ``scale`` keyword to the ``SegmentationImage.to_patches()``
    method to scale the sizes of the polygon patches. [#1641, #1646]

  - Improved the ``SegmentationImage`` ``imshow`` method to ensure that
    labels are plotted with unique colors. [#1649]

  - Added a ``imshow_map`` method to ``SegmentationImage`` for plotting
    segmentation images with a small number of non-consecutive labels.
    [#1649]

  - Added a ``reset_cmap`` method to ``SegmentationImage`` for resetting
    the colormap to a new random colormap. [#1649]

- ``photutils.utils``

  - Improved the generation of random aperture positions in
    ``ImageDepth``. [#1666]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed an issue where the aperture ``plot`` method ``**kwargs`` were
    not reset to the default values when called multiple times. [#1655]

- ``photutils.psf``

  - Fixed a bug where ``SourceGrouper`` would fail if only one source
    was input. [#1617]

  - Fixed a bug in ``GriddedPSFModel`` ``plot_grid`` where the grid
    could be plotted incorrectly if the input ``xygrid`` was not sorted
    in y then x order. [#1661]

- ``photutils.segmentation``

  - Fixed an issue where ``deblend_sources`` and ``SourceFinder`` would
    raise an error if the ``contrast`` keyword was set to 1 (meaning no
    deblending). [#1636]

  - Fixed an issue where the vertices of the ``SegmentationImage``
    ``polygons`` were shifted by 0.5 pixels in both x and y. [#1646]

API Changes
^^^^^^^^^^^

- The metadata in output tables now contains a timestamp. [#1640]

- The order of the metadata in a table is now preserved when writing to
  a file. [#1640]

- ``photutils.psf``

  - Deprecated the ``prepare_psf_model`` function. Use the new
    ``make_psf_model`` function instead. [#1658]

  - The ``GriddedPSFModel`` now stores the ePSF grid such that it is
    first sorted by y then by x. As a result, the order of the ``data``
    and ``xygrid`` attributes may be different. [#1661]

  - The ``oversampling`` attribute is now stored as a 1D
    ``numpy.ndarray`` with two elements. [#1664]

  - A ``ValueError`` is raised if ``GriddedPSFModel`` is called with x
    and y arrays that have more than 2 dimensions. [#1662]

- ``photutils.segmentation``

  - Removed the deprecated ``kernel`` keyword from ``SourceCatalog``.
    [#1613]


1.9.0 (2023-08-14)
------------------

General
^^^^^^^

- The minimum required Python is now 3.9. [#1569]

- The minimum required NumPy is now 1.22. [#1572]

New Features
^^^^^^^^^^^^

- ``photutils.background``

  - Added ``LocalBackground`` class for computing local backgrounds in a
    circular annulus aperture. [#1556]

- ``photutils.datasets``

  - Added new ``make_test_psf_data`` function. [#1558, #1582, #1585]

- ``photutils.psf``

  - Propagate measurement uncertainties in PSF fitting. [#1543]

  - Added new ``PSFPhotometry`` and ``IterativePSFPhotometry`` classes
    for performing PSF-fitting photometry. [#1558, #1559, #1563, #1566,
    #1567, #1581, #1586, #1590, #1594, #1603, #1604]

  - Added a new ``SourceGrouper`` class. [#1558, #1605]

  - Added a ``GriddedPSFModel`` ``fill_value`` attribute. [#1583]

  - Added a ``grid_from_epsfs`` function to make a ``GriddedPSFModel``
    from ePSFs. [#1596]

  - Added a ``read`` method to ``GriddedPSFModel`` for reading "STDPSF"
    FITS files containing grids of ePSF models. [#1557]

  - Added a ``plot_grid`` method to ``GriddedPSFModel`` for plotting
    ePSF grids. [#1557]

  - Added a ``STDPSFGrid`` class for reading "STDPSF" FITS files
    containing grids of ePSF models and plotting the ePSF grids. [#1557]


Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed a bug in the validation of ``PixelAperture`` positions. [#1553]

API Changes
^^^^^^^^^^^

- ``photutils.psf``

  - Deprecated the PSF photometry classes ``BasicPSFPhotometry``,
    ``IterativelySubtractedPSFPhotometry``, and
    ``DAOPhotPSFPhotometry``. Use the new ``PSFPhotometry`` or
    ``IterativePSFPhotometry`` class instead. [#1578]

  - Deprecated the ``DAOGroup``, ``DBSCANGroup``, and ``GroupStarsBase``
    classes. Use the new ``SourceGrouper`` class instead. [#1578]

  - Deprecated the ``get_grouped_psf_model`` and ``subtract_psf``
    function. [#1578]


1.8.0 (2023-05-17)
------------------

General
^^^^^^^

- The minimum required Numpy is now 1.21. [#1528]

- The minimum required Scipy is now 1.7.0. [#1528]

- The minimum required Matplotlib is now 3.5.0. [#1528]

- The minimum required scikit-image is now 0.19.0. [#1528]

- The minimum required gwcs is now 0.18. [#1528]

New Features
^^^^^^^^^^^^

- ``photutils.profiles``

  - The ``RadialProfile`` and ``CurveOfGrowth`` radial bins can now be
    directly input, which also allows for non-uniform radial spacing.
    [#1540]

Bug Fixes
^^^^^^^^^

- ``photutils.psf``

  - Fixed an issue with the local model cache in ``GriddedPSFModel``,
    significantly improving performance. [#1536]

API Changes
^^^^^^^^^^^

- Removed the deprecated ``axes`` keyword in favor of ``ax`` for
  consistency with other packages. [#1523]

- ``photutils.aperture``

  - Removed the ``ApertureStats`` ``unpack_nddata`` method. [#1537]

- ``photutils.profiles``

  - The API for defining the radial bins for the ``RadialProfile`` and
    ``CurveOfGrowth`` classes was changed. While the new API allows for
    more flexibility, unfortunately, it is not backwards-compatible.
    [#1540]

- ``photutils.segmentation``

  - Removed the deprecated ``kernel`` keyword from ``detect_sources``
    and ``deblend_sources``. [#1524]

  - Deprecated the ``kernel`` keyword in ``SourceCatalog``. [#1525]

  - Removed the deprecated ``outline_segments`` method from
    ``SegmentationImage``. [#1526]

  - The ``SourceCatalog`` ``kron_params`` attribute is no longer
    returned as a ``ndarray``. It is returned as a ``tuple``. [#1531]


1.7.0 (2023-04-05)
------------------

General
^^^^^^^

- The ``rasterio`` and ``shapely`` packages are now optional
  dependencies. [#1509]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - Significantly improved the performance of ``aperture_photometry``
    and the ``PixelAperture`` ``do_photometry`` method for large arrays.
    [#1485]

  - Significantly improved the performance of the ``PixelAperture``
    ``area_overlap`` method, especially for large arrays. [#1490]

- ``photutils.profiles``

  - Added a new ``profiles`` subpackage containing ``RadialProfile`` and
    ``CurveOfGrowth`` classes. [#1494, #1496, #1498, #1499]

- ``photutils.psf``

  - Significantly improved the performance of evaluating and fitting
    ``GriddedPSFModel`` instances. [#1503]

- ``photutils.segmentation``

  - Added a ``size`` keyword to the ``SegmentationImage``
    ``make_source_mask`` method. [#1506]

  - Significantly improved the performance of ``SegmentationImage``
    ``make_source_mask`` when using square footprints for source
    dilation. [#1506]

  - Added the ``polygons`` property and ``to_patches`` and
    ``plot_patches`` methods to ``SegmentationImage``. [#1509]

  - Added ``polygon`` keyword to the ``Segment`` class. [#1509]

Bug Fixes
^^^^^^^^^

- ``photutils.centroids``

  - Fixed an issue where ``centroid_quadratic`` would sometimes fail if
    the input data contained NaNs. [#1495]

- ``photutils.detection``

  - Fixed an issue with the starfinders (``DAOStarFinder``,
    ``IRAFStarFinder``, and ``StarFinder``) where an exception was
    raised if ``exclude_border=True`` and there were no detections.
    [#1512].

- ``photutils.isophote``

  - Fixed a bug where the upper harmonics (a3, a4, b3, and b4) had the
    incorrect sign. [#1501]

  - Fixed a bug in the calculation of the upper harmonic errors (a3_err,
    a4_err, b3_err, and b4_err). [#1501].

- ``photutils.psf``

  - Fixed an issue where the PSF-photometry progress bar was not shown.
    [#1517]

  - Fixed an issue where all PSF uncertainties were excluded if the last
    star group had no covariance matrix. [#1519]

- ``photutils.utils``

  - Fixed a bug in the calculation of ``ImageCutout`` ``xyorigin`` when
    using the ``'partial'`` mode when the cutout extended beyond the
    right or top edge. [#1508]

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - The ``ApertureStats`` ``local_bkg`` keyword can now be broadcast for
    apertures with multiple positions. [#1504]

- ``photutils.centroids``

  - The ``centroid_sources`` function will now raise an error if the
    cutout mask contains all ``True`` values. [#1516]

- ``photutils.datasets``

  - Removed the deprecated ``load_fermi_image`` function. [#1479]

- ``photutils.psf``

  - Removed the deprecated ``sandbox`` classes ``DiscretePRF`` and
    ``Reproject``. [#1479]

- ``photutils.segmentation``

  - Removed the deprecated ``make_source_mask`` function in favor of the
    ``SegmentationImage.make_source_mask`` method. [#1479]

  - The ``SegmentationImage`` ``imshow`` method now uses "nearest"
    interpolation instead of "none" to avoid rendering issues with some
    backends. [#1507]

  - The ``repr()`` notebook output for the ``Segment`` class now
    includes a SVG polygon representation of the segment if the
    ``rasterio`` and ``shapely`` packages are installed. [#1509]

  - Deprecated the ``SegmentationImage`` ``outline_segments`` method.
    Use the ``plot_patches`` method instead. [#1509]


1.6.0 (2022-12-09)
------------------

General
^^^^^^^

- Following NEP 29, the minimum required Numpy is now 1.20. [#1442]

- The minimum required Matplotlib is now 3.3.0. [#1442]

- The minimum required scikit-image is now 0.18.0. [#1442]

- The minimum required scikit-learn is now 1.0. [#1442]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - The ``ApertureStats`` class now accepts astropy ``NDData`` objects
    as input. [#1409]

  - Improved the performance of aperture photometry by 10-25% (depending
    on the number of aperture positions). [#1438]

- ``photutils.psf``

  - Added a progress bar for fitting PSF photometry [#1426]

  - Added a ``subshape`` keyword to the PSF-fitting classes to define
    the shape over which the PSF is subtracted. [#1477]

- ``photutils.segmentation``

  - Added the ability to slice ``SegmentationImage`` objects. [#1413]

  - Added ``mode`` and ``fill_value`` keywords to ``SourceCatalog``
    ``make_cutouts`` method. [#1420]

  - Added ``segment_area`` source property and ``wcs``,
    ``localbkg_width``, ``apermask_method``, and ``kron_params``
    attributes to ``SourceCatalog``. [#1425]

  - Added the ability to use ``Quantity`` arrays with
    ``detect_threshold``, ``detect_sources``, ``deblend_sources``, and
    ``SourceFinder``. [#1436]

  - The progress bar used when deblending sources now is prepended with
    "Deblending". [#1439]

  - Added "windowed" centroids to ``SourceCatalog``. [#1447, #1468]

  - Added quadratic centroids to ``SourceCatalog``. [#1467, #1469]

  - Added a ``progress_bar`` option to ``SourceCatalog`` for displaying
    progress bars when calculating some source properties. [#1471]

- ``photutils.utils``

  - Added ``xyorigin`` attribute to ``CutoutImage``. [#1419]

  - Added ``ImageDepth`` class. [#1434]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed a bug in the ``PixelAperture`` ``area_overlap`` method so that
    the returned value does not inherit the data units. [#1408]

  - Fixed an issue in ``ApertureStats`` ``get_ids`` for the case when
    the ID numbers are not sorted (due to slicing). [#1423]

- ``photutils.datasets``

  - Fixed a bug in the various ``load`` functions where FITS files were
    not closed. [#1455]

- ``photutils.segmentation``

  - Fixed an issue in the ``SourceCatalog`` ``kron_photometry``,
    ``make_kron_apertures``, and ``plot_kron_apertures`` methods where
    the input minimum Kron and circular radii would not be applied.
    Instead the instance-level minima would always be used. [#1421]

  - Fixed an issue where the ``SourceCatalog`` ``plot_kron_apertures``
    method would raise an error for a scalar ``SourceCatalog``. [#1421]

  - Fixed an issue in ``SourceCatalog`` ``get_labels`` for the case when
    the labels are not sorted (due to slicing). [#1423]

API Changes
^^^^^^^^^^^

- Deprecated ``axes`` keyword in favor of ``ax`` for consistency with
  other packages. [#1432]

- Importing tools from all subpackages now requires including the
  subpackage name.

- ``photutils.aperture``

  - Inputting ``PixelAperture`` positions as an Astropy ``Quantity`` in
    pixel units is no longer allowed. [#1398]

  - Inputting ``SkyAperture`` shape parameters as an Astropy
    ``Quantity`` in pixel units is no longer allowed. [#1398]

  - Removed the deprecated ``BoundingBox`` ``as_patch`` method. [#1462]

- ``photutils.centroids``

  - Removed the deprecated ``oversampling`` keyword in ``centroid_com``.
    [#1398]

- ``photutils.datasets``

  - Deprecated the ``load_fermi_image`` function. [#1455]

- ``photutils.psf``

  - Removed the deprecated ``flux_residual_sigclip`` keyword in
    ``EPSFBuilder``. Use ``sigma_clip`` instead. [#1398]

  - PSF photometry classes will no longer emit a RuntimeWarning if the
    fitted parameter variance is negative. [#1458]

- ``photutils.segmentation``

  - Removed the deprecated ``sigclip_sigma`` and ``sigclip_iters``
    keywords in ``detect_threshold``. Use the ``sigma_clip`` keyword
    instead. [#1398]

  - Removed the ``mask_value``, ``sigclip_sigma``, and ``sigclip_iters``
    keywords in ``detect_threshold``. Use the ``mask`` or ``sigma_clip``
    keywords instead. [#1398]

  - Removed the deprecated the ``filter_fwhm`` and ``filter_size``
    keywords in ``make_source_mask``. Use the ``kernel`` keyword instead.
    [#1398]

  - If ``detection_cat`` is input to ``SourceCatalog``, then the
    detection catalog source centroids and morphological/shape
    properties will be returned instead of calculating them from the
    input data. Also, if ``detection_cat`` is input, then the input
    ``wcs``, ``apermask_method``, and ``kron_params`` keywords will be
    ignored. [#1425]


1.5.0 (2022-07-12)
------------------

General
^^^^^^^

- Added ``tqdm`` as an optional dependency. [#1364]

New Features
^^^^^^^^^^^^

- ``photutils.psf``

  - Added a ``mask`` keyword when calling the PSF-fitting classes.
    [#1350, #1351]

  - The ``EPSFBuilder`` progress bar will use ``tqdm`` if the optional
    package is installed. [#1367]

- ``photutils.segmentation``

  - Added ``SourceFinder`` class, which is a convenience class
    combining ``detect_sources`` and ``deblend_sources``. [#1344]

  - Added a ``sigma_clip`` keyword to ``detect_threshold``. [#1354]

  - Added a ``make_source_mask`` method to ``SegmentationImage``.
    [#1355]

  - Added a ``make_2dgaussian_kernel`` convenience function. [#1356]

  - Allow ``SegmentationImage.make_cmap`` ``background_color`` to be in
    any matplotlib color format. [#1361]

  - Added an ``imshow`` convenience method to ``SegmentationImage``.
    [#1362]

  - Improved performance of ``deblend_sources``. [#1364]

  - Added a ``progress_bar`` keyword to ``deblend_sources``. [#1364]

  - Added a ``'sinh'`` mode to ``deblend_sources``. [#1368]

  - Improved the resetting of cached ``SegmentationImage`` properties so
    that custom (non-cached) attributes can be kept. [#1368]

  - Added a ``nproc`` keyword to enable multiprocessing in
    ``deblend_sources`` and ``SourceFinder``. [#1372]

  - Added a ``make_cutouts`` method to ``SourceCatalog`` for making
    custom-shaped cutout images. [#1376]

  - Added the ability to set a minimum unscaled Kron radius in
    ``SourceCatalog``. [#1381]

- ``photutils.utils``

  - Added a ``circular_footprint`` convenience function. [#1355]

  - Added a ``CutoutImage`` class. [#1376]

Bug Fixes
^^^^^^^^^

- ``photutils.psf``

  - Fixed a warning message in ``EPSFFitter``. [#1382]

- ``photutils.segmentation``

  - Fixed an issue in generating watershed markers used for source
    deblending. [#1383]

API Changes
^^^^^^^^^^^

- ``photutils.centroids``

  - Changed the axes order of ``oversampling`` keyword in
    ``centroid_com`` when input as a tuple. [#1358]

  - Deprecated the ``oversampling`` keyword in ``centroid_com``. [#1377]

- ``photutils.psf``

  - Invalid data values (i.e., NaN or inf) are now automatically masked
    when performing PSF fitting. [#1350]

  - Deprecated the ``sandbox`` classes ``DiscretePRF`` and
    ``Reproject``. [#1357]

  - Changed the axes order of ``oversampling`` keywords when input as a
    tuple. [#1358]

  - Removed the unused ``shift_val`` keyword in ``EPSFBuilder`` and
    ``EPSFModel``. [#1377]

  - Renamed the ``flux_residual_sigclip`` keyword (now deprecated) to
    ``sigma_clip`` in ``EPSFBuilder``. [#1378]

  - The ``EPSFBuilder`` progress bar now requires that the optional
    ``tqdm`` package be installed. [#1379]

  - The tools in the PSF package now require keyword-only arguments.
    [#1386]

- ``photutils.segmentation``

  - Removed the deprecated ``circular_aperture`` method from
    ``SourceCatalog``. [#1329]

  - The ``SourceCatalog`` ``plot_kron_apertures`` method now sets a
    default ``kron_apers`` value. [#1346]

  - ``deblend_sources`` no longer allows an array to be input as a
    segmentation image. It must be a ``SegmentationImage`` object.
    [#1347]

  - ``SegmentationImage`` no longer allows array-like input. It must be
    a numpy ``ndarray``. [#1347]

  - Deprecated the ``sigclip_sigma`` and ``sigclip_iters`` keywords in
    ``detect_threshold``. Use the ``sigma_clip`` keyword instead. [#1354]

  - Deprecated the ``make_source_mask`` function in favor of the
    ``SegmentationImage.make_source_mask`` method. [#1355]

  - Deprecated the ``kernel`` keyword in ``detect_sources`` and
    ``deblend_sources``. Instead, if filtering is desired, input a
    convolved image directly into the ``data`` parameter. [#1365]

  - Sources with a data minimum of zero are now treated the same as
    negative minima (i.e., the mode is changed to "linear") for the
    "exponential" deblending mode. [#1368]

  - A single warning (as opposed to 1 per source) is now raised about
    negative/zero minimum data values using the 'exponential' deblending
    mode. The affected labels is available in a new "info" attribute.
    [#1368]

  - If the mode in ``deblend_sources`` is "exponential" or "sinh" and there
    are too many potential deblended sources within a given source
    (watershed markers), a warning will be raised and the mode will be
    changed to "linear". [#1369]

  - The ``SourceCatalog`` ``make_circular_apertures`` and
    ``make_kron_apertures`` methods now return a single aperture
    (instead of a list with one item) for a scalar ``SourceCatalog``.
    [#1376]

  - The ``SourceCatalog`` ``kron_params`` keyword now has an optional
    third item representing the minimum circular radius. [#1381]

  - The ``SourceCatalog`` ``kron_radius`` is now set to the minimum Kron
    radius (the second element of ``kron_params``) if the data or
    radially weighted data sum to zero. [#1381]

- ``photutils.utils``

  - The colormap returned from ``make_random_cmap`` now has colors in
    RGBA format. [#1361]


1.4.0 (2022-03-25)
------------------

General
^^^^^^^

- The minimum required Python is now 3.8. [#1279]

- The minimum required Numpy is now 1.18. [#1279]

- The minimum required Astropy is now 5.0. [#1279]

- The minimum required Matplotlib is now 3.1. [#1279]

- The minimum required scikit-image is now 0.15.0 [#1279]

- The minimum required gwcs is now 0.16.0 [#1279]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - Added a ``copy`` method to ``Aperture`` objects. [#1304]

  - Added the ability to compare ``Aperture`` objects for equality.
    [#1304]

  - The ``theta`` keyword for ``EllipticalAperture``, ``EllipticalAnnulus``,
    ``RectangularAperture``, and ``RectangularEllipse`` can now be an
    Astropy ``Angle`` or ``Quantity`` in angular units. [#1308]

  - Added an ``ApertureStats`` class for computing statistics of
    unmasked pixels within an aperture. [#1309, #1314, #1315, #1318]

  - Added a ``dtype`` keyword to the ``ApertureMask`` ``to_image``
    method. [#1320]

- ``photutils.background``

  - Added an ``alpha`` keyword to the ``Background2D.plot_meshes``
    method. [#1286]

  - Added a ``clip`` keyword to the ``BkgZoomInterpolator`` class.
    [#1324]

- ``photutils.segmentation``

  - Added ``SegmentationImage`` ``cmap`` attribute containing a default
    colormap. [#1319]

  - Improved the performance of ``SegmentationImage`` and
    ``SourceCatalog``, especially for large data arrays. [#1320]

  - Added a ``convolved_data`` keyword to ``SourceCatalog``. This is
    recommended instead of using the ``kernel`` keyword. [#1321]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed a bug in ``aperture_photometry`` where an error was not raised
    if the data and error arrays have different units. [#1285].

- ``photutils.background``

  - Fixed a bug in ``Background2D`` where using the ``pad`` edge method
    would result in incorrect image padding if only one of the axes needed
    padding. [#1292]

- ``photutils.centroids``

  - Fixed a bug in ``centroid_sources`` where setting ``error``,
    ``xpeak``, or ``ypeak`` to ``None`` would result in an error.
    [#1297]

  - Fixed a bug in ``centroid_quadratic`` where inputting a mask
    would alter the input data array. [#1317]

- ``photutils.segmentation``

  - Fixed a bug in ``SourceCatalog`` where a ``UFuncTypeError`` would
    be raised if the input ``data`` had an integer ``dtype`` [#1312].

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - A ``ValueError`` is now raised if non-positive sizes are input to
    sky-based apertures. [#1295]

  - The ``BoundingBox.plot()`` method now returns a
    ``matplotlib.patches.Patch`` object. [#1305]

  - Inputting ``PixelAperture`` positions as an Astropy ``Quantity`` in
    pixel units is deprecated. [#1310]

  - Inputting ``SkyAperture`` shape parameters as an Astropy
    ``Quantity`` in pixel units is deprecated. [#1310]

- ``photutils.background``

  - Removed the deprecated ``background_mesh_ma`` and
    ``background_rms_mesh_ma`` ``Background2D`` properties. [#1280]

  - By default, ``BkgZoomInterpolator`` uses ``clip=True`` to prevent
    the interpolation from producing values outside the given input
    range. If backwards-compatibility is needed with older Photutils
    versions, set ``clip=False``. [#1324]

- ``photutils.centroids``

  - Removed the deprecated ``centroid_epsf`` and ``gaussian1d_moments``
    functions. [#1280]

  - Importing tools from the centroids subpackage now requires including
    the subpackage name. [#1280]

- ``photutils.morphology``

  - Importing tools from the morphology subpackage now requires
    including the subpackage name. [#1280]

- ``photutils.segmentation``

  - Removed the deprecated ``source_properties`` function and the
    ``SourceProperties`` and ``LegacySourceCatalog`` classes. [#1280]

  - Removed the deprecated the ``filter_kernel`` keyword in the
    ``detect_sources``, ``deblend_sources``, and ``make_source_mask``
    functions. [#1280]

  - A ``TypeError`` is raised if the input array to
    ``SegmentationImage`` does not have integer type. [#1319]

  - A ``SegmentationImage`` may contain an array of all zeros. [#1319]

  - Deprecated the ``mask_value`` keyword in ``detect_threshold``. Use
    the ``mask`` keyword instead. [#1322]

  - Deprecated the ``filter_fwhm`` and ``filter_size`` keywords in
    ``make_source_mask``. Use the ``kernel`` keyword instead. [#1322]


1.3.0 (2021-12-21)
------------------

General
^^^^^^^

- The metadata in output tables now contains version information for all
  dependencies. [#1274]

New Features
^^^^^^^^^^^^

- ``photutils.centroids``

  - Extra keyword arguments can be input to ``centroid_sources`` that
    are then passed on to the ``centroid_func`` if supported.
    [#1276, #1278]

- ``photutils.segmentation``

  - Added ``copy`` method to ``SourceCatalog``. [#1264]

  - Added ``kron_photometry`` method to ``SourceCatalog``. [#1264]

  - Added ``add_extra_property``, ``remove_extra_property``,
    ``remove_extra_properties``, and ``rename_extra_property`` methods
    and ``extra_properties`` attribute to ``SourceCatalog``. [#1264,
    #1268]

  - Added ``name`` and ``overwrite`` keywords to ``SourceCatalog``
    ``circular_photometry`` and ``fluxfrac_radius`` methods. [#1264]

  - ``SourceCatalog`` ``fluxfrac_radius`` was improved for cases where
    the source flux doesn't monotonically increase with increasing radius.
    [#1264]

  - Added ``meta`` and ``properties`` attributes to ``SourceCatalog``.
    [#1268]

  - The ``SourceCatalog`` output table (using ``to_table``) ``meta``
    dictionary now includes a field for the date/time. [#1268]

  - Added ``SourceCatalog`` ``make_kron_apertures`` method. [#1268]

  - Added ``SourceCatalog`` ``plot_circular_apertures`` and
    ``plot_kron_apertures`` methods. [#1268]

Bug Fixes
^^^^^^^^^

- ``photutils.segmentation``

  - If ``detection_catalog`` is input to ``SourceCatalog`` then the
    detection centroids are used to calculate the ``circular_aperture``,
    ``circular_photometry``, and ``fluxfrac_radius``. [#1264]

  - Units are applied to ``SourceCatalog`` ``circular_photometry``
    output if the input data has units. [#1264]

  - ``SourceCatalog`` ``circular_photometry`` returns scalar values if
    catalog is scalar. [#1264]

  - ``SourceCatalog`` ``fluxfrac_radius`` returns a ``Quantity`` with
    pixel units. [#1264]

  - Fixed a bug where the ``SourceCatalog`` ``detection_catalog`` was
    not indexed/sliced when ``SourceCatalog`` was indexed/sliced. [#1268]

  - ``SourceCatalog`` ``circular_photometry`` now returns NaN for
    completely-masked sources. [#1268]

  - ``SourceCatalog`` ``kron_flux`` is always NaN for sources where
    ``kron_radius`` is NaN. [#1268]

  - ``SourceCatalog`` ``fluxfrac_radius`` now returns NaN if
    ``kron_flux`` is zero. [#1268]

API Changes
^^^^^^^^^^^

- ``photutils.centroids``

  - A ``ValueError`` is now raised in ``centroid_sources`` if the input
    ``xpos`` or ``ypos`` is outside of the input ``data``. [#1276]

  - A ``ValueError`` is now raised in ``centroid_quadratic`` if the input
    ``xpeak`` or ``ypeak`` is outside of the input ``data``. [#1276]

  - NaNs are now returned from ``centroid_sources`` where the centroid
    failed. This is usually due to a ``box_size`` that is too small when
    using a fitting-based centroid function. [#1276]

- ``photutils.segmentation``

  - Renamed the ``SourceCatalog`` ``circular_aperture`` method to
    ``make_circular_apertures``. The old name is deprecated. [#1268]

  - The ``SourceCatalog`` ``kron_params`` keyword must have a minimum
    circular radius that is greater than zero. The default value is now
    1.0. [#1268]

  - ``detect_sources`` now uses ``astropy.convolution.convolve``, which
    allows for masking pixels. [#1269]


1.2.0 (2021-09-23)
------------------

General
^^^^^^^

- The minimum required scipy version is 1.6.0 [#1239]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - Added a ``mask`` keyword to the ``area_overlap`` method. [#1241]

- ``photutils.background``

  - Improved the performance of ``Background2D`` by up to 10-50% when
    the optional ``bottleneck`` package is installed. [#1232]

  - Added a ``masked`` keyword to the background
    classes ``MeanBackground``, ``MedianBackground``,
    ``ModeEstimatorBackground``, ``MMMBackground``,
    ``SExtractorBackground``, ``BiweightLocationBackground``,
    ``StdBackgroundRMS``, ``MADStdBackgroundRMS``, and
    ``BiweightScaleBackgroundRMS``. [#1232]

  - Enable all background classes to work with ``Quantity`` inputs.
    [#1233]

  - Added a ``markersize`` keyword to the ``Background2D`` method
    ``plot_meshes``. [#1234]

  - Added ``__repr__`` methods to all background classes. [#1236]

  - Added a ``grid_mode`` keyword to ``BkgZoomInterpolator``. [#1239]

- ``photutils.detection``

  - Added a ``xycoords`` keyword to ``DAOStarFinder`` and
    ``IRAFStarFinder``. [#1248]

- ``photutils.psf``

  - Enabled the reuse of an output table from ``BasicPSFPhotometry`` and
    its subclasses as an initial guess for another photometry run. [#1251]

  - Added the ability to skip the ``group_maker`` step by inputing an
    initial guess table with a ``group_id`` column. [#1251]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed a bug when converting between pixel and sky apertures with a
    ``gwcs`` object. [#1221]

- ``photutils.background``

  - Fixed an issue where ``Background2D`` could fail when using the
    ``'pad'`` edge method. [#1227]

- ``photutils.detection``

  - Fixed the ``DAOStarFinder`` import deprecation message. [#1195]

- ``photutils.morphology``

  - Fixed an issue in ``data_properties`` where a scalar background
    input would raise an error. [#1198]

- ``photutils.psf``

  - Fixed an issue in ``prepare_psf_model`` when ``xname`` or ``yname``
    was ``None`` where the model offsets were applied in the wrong
    direction, resulting in the initial photometry guesses not being
    improved by the fit. [#1199]

- ``photutils.segmentation``

  - Fixed an issue in ``SourceCatalog`` where the user-input ``mask``
    was ignored when ``apermask_method='correct'`` for Kron-related
    calculations. [#1210]

  - Fixed an issue in ``SourceCatalog`` where the ``segment`` array
    could incorrectly have units. [#1220]

- ``photutils.utils``

  - Fixed an issue in ``ShepardIDWInterpolator`` to allow its
    initialization with scalar data values and coordinate arrays having
    more than one dimension. [#1226]

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - The ``ApertureMask.get_values()`` function now returns an empty
    array if there is no overlap with the data. [#1212]

  - Removed the deprecated ``BoundingBox.slices`` and
    ``PixelAperture.bounding_boxes`` attributes. [#1215]

- ``photutils.background``

  - Invalid data values (i.e., NaN or inf) are now automatically masked
    in ``Background2D``. [#1232]

  - The background classes ``MeanBackground``, ``MedianBackground``,
    ``ModeEstimatorBackground``, ``MMMBackground``,
    ``SExtractorBackground``, ``BiweightLocationBackground``,
    ``StdBackgroundRMS``, ``MADStdBackgroundRMS``, and
    ``BiweightScaleBackgroundRMS`` now return by default a
    ``numpy.ndarray`` with ``np.nan`` values representing masked pixels
    instead of a masked array. A masked array can be returned by setting
    ``masked=True``. [#1232]

  - Deprecated the ``Background2D`` attributes ``background_mesh_ma``
    and ``background_rms_mesh_ma``. They have been renamed to
    ``background_mesh_masked`` and ``background_rms_mesh_masked``.
    [#1232]

  - By default, ``BkgZoomInterpolator`` now uses ``grid_mode=True``.
    For zooming 2D images, this keyword should be set to True,
    which makes the interpolator's behavior consistent with
    ``scipy.ndimage.map_coordinates``, ``skimage.transform.resize``, and
    ``OpenCV (cv2.resize)``. If backwards-compatibility is needed with
    older Photutils versions, set ``grid_mode=False``. [#1239]

- ``photutils.centroids``

  - Deprecated the ``gaussian1d_moments`` and ``centroid_epsf``
    functions. [#1240]

- ``photutils.datasets``

  - Removed the deprecated ``random_state`` keyword in the
    ``apply_poisson_noise``, ``make_noise_image``,
    ``make_random_models_table``, and ``make_random_gaussians_table``
    functions. [#1244]

  - ``make_random_models_table`` and ``make_random_gaussians_table`` now
    return an astropy ``QTable`` with version metadata. [#1247]

- ``photutils.detection``

  - ``DAOStarFinder``, ``IRAFStarFinder``, and ``find_peaks`` now return
    an astropy ``QTable`` with version metadata. [#1247]

  - The ``StarFinder`` ``label`` column was renamed to ``id`` for
    consistency with the other star finder classes. [#1254]

- ``photutils.isophote``

  - The ``Isophote`` ``to_table`` method nows return an astropy
    ``QTable`` with version metadata. [#1247]

- ``photutils.psf``

  - ``BasicPSFPhotometry``, ``IterativelySubtractedPSFPhotometry``, and
    ``DAOPhotPSFPhotometry`` now return an astropy ``QTable`` with
    version metadata. [#1247]

- ``photutils.segmentation``

  - Deprecated the ``filter_kernel`` keyword in the ``detect_sources``,
    ``deblend_sources``, and ``make_source_mask`` functions. It has been
    renamed to simply ``kernel`` for consistency with ``SourceCatalog``.
    [#1242]

  - Removed the deprecated ``random_state`` keyword in the ``make_cmap``
    method. [#1244]

  - The ``SourceCatalog`` ``to_table`` method nows return an astropy
    ``QTable`` with version metadata. [#1247]

- ``photutils.utils``

  - Removed the deprecated ``check_random_state`` function. [#1244]

  - Removed the deprecated ``random_state`` keyword in the
    ``make_random_cmap`` function. [#1244]


1.1.0 (2021-03-20)
------------------

General
^^^^^^^

- The minimum required python version is 3.7. [#1120]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - The ``PixelAperture.plot()`` method now returns a list of
    ``matplotlib.patches.Patch`` objects. [#923]

  - Added an ``area_overlap`` method for ``PixelAperture`` objects that
    gives the overlapping area of the aperture on the data. [#874]

  - Added a ``get_overlap_slices`` method and a ``center`` attribute to
    ``BoundingBox``. [#1157]

  - Added a ``get_values`` method to ``ApertureMask`` that returns a 1D
    array of mask-weighted values. [#1158, #1161]

  - Added ``get_overlap_slices`` method to ``ApertureMask``. [#1165]

- ``photutils.background``

  - The ``Background2D`` class now accepts astropy ``NDData``,
    ``CCDData``, and ``Quantity`` objects as data inputs. [#1140]

- ``photutils.detection``

  - Added a ``StarFinder`` class to detect stars with a user-defined
    kernel. [#1182]

- ``photutils.isophote``

  - Added the ability to specify the output columns in the
    ``IsophoteList`` ``to_table`` method. [#1117]

- ``photutils.psf``

  - The ``EPSFStars`` class is now usable with multiprocessing. [#1152]

  - Slicing ``EPSFStars`` now returns an ``EPSFStars`` instance. [#1185]

- ``photutils.segmentation``

  - Added a modified, significantly faster, ``SourceCatalog`` class.
    [#1170, #1188, #1191]

  - Added ``circular_aperture`` and ``circular_photometry`` methods to
    the ``SourceCatalog`` class. [#1188]

  - Added ``fwhm`` property to the ``SourceCatalog`` class. [#1191]

  - Added ``fluxfrac_radius`` method to the ``SourceCatalog`` class.
    [#1192]

  - Added a ``bbox`` attribute to ``SegmentationImage``. [#1187]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Slicing a scalar ``Aperture`` object now raises an informative error
    message. [#1154]

  - Fixed an issue where ``ApertureMask.multiply`` ``fill_value`` was
    not applied to pixels outside of the aperture mask, but within the
    aperture bounding box. [#1158]

  - Fixed an issue where ``ApertureMask.cutout`` would raise an error
    if ``fill_value`` was non-finite and the input array was integer
    type. [#1158]

  - Fixed an issue where ``RectangularAnnulus`` with a non-default
    ``h_in`` would give an incorrect ``ApertureMask``. [#1160]

- ``photutils.isophote``

  - Fix computation of gradient relative error when gradient=0. [#1180]

- ``photutils.psf``

  - Fixed a bug in ``EPSFBuild`` where a warning was raised if the input
    ``smoothing_kernel`` was an ``numpy.ndarray``. [#1146]

  - Fixed a bug that caused photometry to fail on an ``EPSFmodel`` with
    multiple stars in a group. [#1135]

  - Added a fallback ``aperture_radius`` for PSF models without a FWHM
    or sigma attribute, raising a warning. [#740]

- ``photutils.segmentation``

  - Fixed ``SourceProperties`` ``local_background`` to work with
    Quantity data inputs. [#1162]

  - Fixed ``SourceProperties`` ``local_background`` for sources near the
    image edges. [#1162]

  - Fixed ``SourceProperties`` ``kron_radius`` for sources that are
    completely masked. [#1164]

  - Fixed ``SourceProperties`` Kron properties for sources near the
    image edges. [#1167]

  - Fixed ``SourceProperties`` Kron mask correction. [#1167]

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - Deprecated the ``BoundingBox`` ``slices`` attribute. Use the
    ``get_overlap_slices`` method instead. [#1157]

- ``photutils.centroids``

  - Removed the deprecated ``fit_2dgaussian`` function and
    ``GaussianConst2D`` class. [#1147]

  - Importing tools from the centroids subpackage without including the
    subpackage name is deprecated. [#1190]

- ``photutils.detection``

  - Importing the ``DAOStarFinder``, ``IRAFStarFinder``, and
    ``StarFinderBase`` classes from the deprecated ``findstars.py``
    module is now deprecated. These classes can be imported using ``from
    photutils.detection import <class>``. [#1173]

  - Importing the ``find_peaks`` function from the deprecated
    ``core.py`` module is now deprecated. This function can be imported
    using ``from photutils.detection import find_peaks``. [#1173]

- ``photutils.morphology``

  - Importing tools from the morphology subpackage without including the
    subpackage name is deprecated. [#1190]

- ``photutils.segmentation``

  - Deprecated the ``"mask_all"`` option in the ``SourceProperties``
    ``kron_params`` keyword. [#1167]

  - Deprecated ``source_properties``, ``SourceProperties``, and
    ``LegacySourceCatalog``.  Use the new ``SourceCatalog`` function
    instead. [#1170]

  - The ``detect_threshold`` function was moved to the ``segmentation``
    subpackage. [#1171]

  - Removed the ability to slice ``SegmentationImage``. Instead slice
    the ``segments`` attribute. [#1187]


1.0.2 (2021-01-20)
------------------

General
^^^^^^^

- ``photutils.background``

  - Improved the performance of ``Background2D`` (e.g., by a factor
    of ~4 with 2048x2048 input arrays when using the default interpolator).
    [#1103, #1108]

Bug Fixes
^^^^^^^^^

- ``photutils.background``

  - Fixed a bug with ``Background2D`` where using ``BkgIDWInterpolator``
    would give incorrect results. [#1104]

- ``photutils.isophote``

  - Corrected calculations of upper harmonics and their errors [#1089]

  - Fixed bug that caused an infinite loop when the sample extracted
    from an image has zero length. [#1129]

  - Fixed a bug where the default ``fixed_parameters`` in
    ``EllipseSample.update()`` were not defined. [#1139]

- ``photutils.psf``

  - Fixed a bug where very incorrect PSF-fitting uncertainties could
    be returned when the astropy fitter did not return fit
    uncertainties. [#1143]

  - Changed the default ``recentering_func`` in ``EPSFBuilder``, to
    avoid convergence issues. [#1144]

- ``photutils.segmentation``

  - Fixed an issue where negative Kron radius values could be returned,
    which would cause an error when calculating Kron fluxes. [#1132]

  - Fixed an issue where an error was raised with
    ``SegmentationImage.remove_border_labels()`` with ``relabel=True``
    when no segments remain. [#1133]


1.0.1 (2020-09-24)
------------------

Bug Fixes
^^^^^^^^^

- ``photutils.psf``

  - Fixed checks on ``oversampling`` factors. [#1086]


1.0.0 (2020-09-22)
------------------

General
^^^^^^^

- The minimum required python version is 3.6. [#952]

- The minimum required astropy version is 4.0. [#1081]

- The minimum required numpy version is 1.17. [#1079]

- Removed ``astropy-helpers`` and updated the package infrastructure
  as described in Astropy APE 17. [#915]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - Added ``b_in`` as an optional ellipse annulus keyword. [#1070]

  - Added ``h_in`` as an optional rectangle annulus keyword. [#1070]

- ``photutils.background``

  - Added ``coverage_mask`` and ``fill_value`` keyword options to
    ``Background2D``. [#1061]

- ``photutils.centroids``

  - Added quadratic centroid estimator function
    (``centroid_quadratic``). [#1067]

- ``photutils.psf``

  - Added the ability to use odd oversampling factors in
    ``EPSFBuilder``. [#1076]

- ``photutils.segmentation``

  - Added Kron radius, flux, flux error, and aperture to
    ``SourceProperties``. [#1068]

  - Added local background to ``SourceProperties``. [#1075]

Bug Fixes
^^^^^^^^^

- ``photutils.isophote``

  - Fixed a typo in the calculation of the ``b4`` higher-order
    harmonic coefficient in ``build_ellipse_model``. [#1052]

  - Fixed a bug where ``build_ellipse_model`` falls into an infinite
    loop when the pixel to fit is outside of the image. [#1039]

  - Fixed a bug where ``build_ellipse_model`` falls into an infinite
    loop under certain image/parameters input combinations. [#1056]

- ``photutils.psf``

  - Fixed a bug in ``subtract_psf`` caused by using a fill_value of
    np.nan with an integer input array. [#1062]

- ``photutils.segmentation``

  - Fixed a bug where ``source_properties`` would fail with unitless
    ``gwcs.wcs.WCS`` objects. [#1020]

- ``photutils.utils``

  - The ``effective_gain`` parameter in ``calc_total_error`` can now
    be zero (or contain zero values). [#1019]

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - Aperture pixel positions can no longer be shaped as 2xN. [#953]

  - Removed the deprecated ``units`` keyword in ``aperture_photometry``
    and ``PixelAperture.do_photometry``. [#953]

  - ``PrimaryHDU``, ``ImageHDU``, and ``HDUList`` can no longer be
    input to ``aperture_photometry``. [#953]

  - Removed the deprecated the Aperture ``mask_area`` method. [#953]

  - Removed the deprecated Aperture plot keywords ``ax`` and
    ``indices``. [#953]

- ``photutils.background``

  - Removed the deprecated ``ax`` keyword in
    ``Background2D.plot_meshes``. [#953]

  - ``Background2D`` keyword options can not be input as positional
    arguments. [#1061]

- ``photutils.centroids``

  - ``centroid_1dg``, ``centroid_2dg``, ``gaussian1d_moments``,
    ``fit_2dgaussian``, and ``GaussianConst2D`` have been moved to a new
    ``photutils.centroids.gaussian`` module. [#1064]

  - Deprecated ``fit_2dgaussian`` and ``GaussianConst2D``. [#1064]

- ``photutils.datasets``

  - Removed the deprecated ``type`` keyword in ``make_noise_image``.
    [#953]

  - Renamed the ``random_state`` keyword (deprecated) to
    ``seed`` in ``apply_poisson_noise``, ``make_noise_image``,
    ``make_random_models_table``, and ``make_random_gaussians_table``
    functions. [#1080]

- ``photutils.detection``

  - Removed the deprecated ``snr`` keyword in ``detect_threshold``.
    [#953]

- ``photutils.psf``

  - Added ``flux_residual_sigclip`` as an input parameter, allowing for
    custom sigma clipping options in ``EPSFBuilder``. [#984]

  - Added ``extra_output_cols`` as a parameter to
    ``BasicPSFPhotometry``, ``IterativelySubtractedPSFPhotometry`` and
    ``DAOPhotPSFPhotometry``. [#745]

- ``photutils.segmentation``

  - Removed the deprecated ``SegmentationImage`` methods ``cmap`` and
    ``relabel``. [#953]

  - Removed the deprecated ``SourceProperties`` ``values`` and ``coords``
    attributes. [#953]

  - Removed the deprecated ``xmin/ymin`` and ``xmax/ymax`` properties.
    [#953]

  - Removed the deprecated ``snr`` and ``mask_value`` keywords in
    ``make_source_mask``. [#953]

  - Renamed the ``random_state`` keyword (deprecated) to ``seed`` in the
    ``make_cmap`` method. [#1080]

- ``photutils.utils``

  - Removed the deprecated ``random_cmap``, ``mask_to_mirrored_num``,
    ``get_version_info``, ``filter_data``, and ``std_blocksum``
    functions. [#953]

  - Removed the deprecated ``wcs_helpers`` functions
    ``pixel_scale_angle_at_skycoord``, ``assert_angle_or_pixel``,
    ``assert_angle``, and ``pixel_to_icrs_coords``. [#953]

  - Deprecated the ``check_random_state`` function. [#1080]

  - Renamed the ``random_state`` keyword (deprecated) to ``seed`` in the
    ``make_random_cmap`` function. [#1080]


0.7.2 (2019-12-09)
------------------

Bug Fixes
^^^^^^^^^

- ``photutils.isophote``

  - Fixed computation of upper harmonics ``a3``, ``b3``, ``a4``, and
    ``b4`` in the ellipse fitting algorithm. [#1008]

- ``photutils.psf``

  - Fix to algorithm in ``EPSFBuilder``, causing issues where ePSFs
    failed to build. [#974]

  - Fix to ``IterativelySubtractedPSFPhotometry`` where an error could
    be thrown when a ``Finder`` was passed which did not return
    ``None`` if no sources were found. [#986]

  - Fix to ``centroid_epsf`` where the wrong oversampling factor was
    used along the y axis. [#1002]


0.7.1 (2019-10-09)
------------------

Bug Fixes
^^^^^^^^^

- ``photutils.psf``

  - Fix to ``IterativelySubtractedPSFPhotometry`` where the residual
    image was not initialized when ``bkg_estimator`` was not supplied.
    [#942]

- ``photutils.segmentation``

  - Fixed a labeling bug in ``deblend_sources``. [#961]

  - Fixed an issue in ``source_properties`` when the input ``data``
    is a ``Quantity`` array. [#963]


0.7 (2019-08-14)
----------------

General
^^^^^^^

- Any WCS object that supports the `astropy shared interface for WCS
  <https://docs.astropy.org/en/stable/wcs/wcsapi.html>`_ is now
  supported. [#899]

- Added a new ``photutils.__citation__`` and ``photutils.__bibtex__``
  attributes which give a citation for photutils in bibtex format. [#926]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - Added parameter validation for all aperture classes. [#846]

  - Added ``from_float``, ``as_artist``, ``union`` and
    ``intersection`` methods to ``BoundingBox`` class. [#851]

  - Added ``shape`` and ``isscalar`` properties to Aperture objects.
    [#852]

  - Significantly improved the performance (~10-20 times faster) of
    aperture photometry, especially when using ``errors`` and
    ``Quantity`` inputs with many aperture positions. [#861]

  - ``aperture_photometry`` now supports ``NDData`` with
    ``StdDevUncertainty`` to input errors. [#866]

  - The ``mode`` keyword in the ``to_sky`` and ``to_pixel`` aperture
    methods was removed to implement the shared WCS interface.  All
    WCS transforms now include distortions (if present). [#899]

- ``photutils.datasets``

  - Added ``make_gwcs`` function to create an example ``gwcs.wcs.WCS``
    object. [#871]

- ``photutils.isophote``

  - Significantly improved the performance (~5 times faster) of
    ellipse fitting. [#826]

  - Added the ability to individually fix the ellipse-fitting
    parameters. [#922]

- ``photutils.psf``

  - Added new centroiding function ``centroid_epsf``. [#816]

- ``photutils.segmentation``

  - Significantly improved the performance of relabeling in
    segmentation images (e.g., ``remove_labels``, ``keep_labels``).
    [#810]

  - Added new ``background_area`` attribute to ``SegmentationImage``.
    [#825]

  - Added new ``data_ma`` attribute to ``Segment``. [#825]

  - Added new ``SegmentationImage`` methods:  ``find_index``,
    ``find_indices``, ``find_areas``, ``check_label``, ``keep_label``,
    ``remove_label``, and ``reassign_labels``. [#825]

  - Added ``__repr__`` and ``__str__`` methods to
    ``SegmentationImage``. [#825]

  - Added ``slices``, ``indices``, and ``filtered_data_cutout_ma``
    attributes to ``SourceProperties``. [#858]

  - Added ``__repr__`` and ``__str__`` methods to ``SourceProperties``
    and ``SourceCatalog``. [#858]

  - Significantly improved the performance of calculating the
    ``background_at_centroid`` property in ``SourceCatalog``. [#863]

  - The default output table columns (source properties) are defined
    in a publicly-accessible variable called
    ``photutils.segmentation.properties.DEFAULT_COLUMNS``. [#863]

  - Added the ``gini`` source property representing the Gini
    coefficient. [#864]

  - Cached (lazy) properties can now be reset in ``SegmentationImage``
    subclasses. [#916]

  - Significantly improved the performance of ``deblend_sources``.  It
    is ~40-50% faster for large images (e.g., 4k x 4k) with a few
    thousand of sources. [#924]

- ``photutils.utils``

  - Added ``NoDetectionsWarning`` class. [#836]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed an issue where the ``ApertureMask.cutout`` method would drop
    the data units when ``copy=True``. [#842]

  - Fixed a corner-case issue where aperture photometry would return
    NaN for non-finite data values outside the aperture but within the
    aperture bounding box. [#843]

  - Fixed an issue where the ``celestial_center`` column (for sky
    apertures) would be a length-1 array containing a ``SkyCoord``
    object instead of a length-1 ``SkyCoord`` object. [#844]

- ``photutils.isophote``

  - Fixed an issue where the linear fitting mode was not working.
    [#912]

  - Fixed the radial gradient computation [#934].

- ``photutils.psf``

  - Fixed a bug in the ``EPSFStar`` ``register_epsf`` and
    ``compute_residual_image`` computations. [#885]

  - A ValueError is raised if ``aperture_radius`` is not input and
    cannot be determined from the input ``psf_model``. [#903]

  - Fixed normalization of ePSF model, now correctly normalizing on
    undersampled pixel grid. [#817]

- ``photutils.segmentation``

  - Fixed an issue where ``deblend_sources`` could fail for sources
    with labels that are a power of 2 and greater than 255. [#806]

  - ``SourceProperties`` and ``source_properties`` will no longer
    raise an exception if a source is completely masked. [#822]

  - Fixed an issue in ``SourceProperties`` and ``source_properties``
    where inf values in the data array were not automatically masked.
    [#822]

  - ``error`` and ``background`` arrays are now always masked
    identically to the input ``data``. [#822]

  - Fixed the ``perimeter`` property to take into account the source
    mask. [#822]

  - Fixed the ``background_at_centroid`` source property to use
    bilinear interpolation. [#822]

  - Fixed ``SegmentationImage`` ``outline_segments`` to include
    outlines along the image boundaries. [#825]

  - Fixed ``SegmentationImage.is_consecutive`` to return ``True`` only
    if the labels are consecutive and start with label=1. [#886]

  - Fixed a bug in ``deblend_sources`` where sources could be
    deblended too much when ``connectivity=8``. [#890]

  - Fixed a bug in ``deblend_sources`` where the ``contrast``
    parameter had little effect if the original segment contained
    three or more sources. [#890]

- ``photutils.utils``

  - Fixed a bug in ``filter_data`` where units were dropped for data
    ``Quantity`` objects. [#872]

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - Deprecated inputting aperture pixel positions shaped as 2xN.
    [#847]

  - Renamed the ``celestial_center`` column to ``sky_center`` in the
    ``aperture_photometry`` output table. [#848]

  - Aperture objects defined with a single (x, y) position (input as
    1D) are now considered scalar objects, which can be checked with
    the new ``isscalar`` Aperture property. [#852]

  - Non-scalar Aperture objects can now be indexed, sliced, and
    iterated. [#852]

  - Scalar Aperture objects now return scalar ``positions`` and
    ``bounding_boxes`` properties and its ``to_mask`` method returns
    an ``ApertureMask`` object instead of a length-1 list containing
    an ``ApertureMask``. [#852]

  - Deprecated the Aperture ``mask_area`` method. [#853]

  - Aperture ``area`` is now an attribute instead of a method. [#854]

  - The Aperture plot keyword ``ax`` was deprecated and renamed to
    ``axes``. [#854]

  - Deprecated the ``units`` keyword in ``aperture_photometry``
    and the ``PixelAperture.do_photometry`` method. [#866, #861]

  - Deprecated ``PrimaryHDU``, ``ImageHDU``, and ``HDUList`` inputs
    to ``aperture_photometry``. [#867]

  - The ``aperture_photometry`` function moved to a new
    ``photutils.aperture.photometry`` module. [#876]

  - Renamed the ``bounding_boxes`` attribute for pixel-based apertures
    to ``bbox`` for consistency. [#896]

  - Deprecated the ``BoundingBox`` ``as_patch`` method (instead use
    ``as_artist``). [#851]

- ``photutils.background``

  - The ``Background2D`` ``plot_meshes`` keyword ``ax`` was deprecated
    and renamed to ``axes``. [#854]

- ``photutils.datasets``

  - The ``make_noise_image`` ``type`` keyword was deprecated and
    renamed to ``distribution``. [#877]

- ``photutils.detection``

  - Removed deprecated ``subpixel`` keyword for ``find_peaks``. [#835]

  - ``DAOStarFinder``, ``IRAFStarFinder``, and ``find_peaks`` now return
    ``None`` if no source/peaks are found.  Also, for this case a
    ``NoDetectionsWarning`` is issued. [#836]

  - Renamed the ``snr`` (deprecated) keyword to ``nsigma`` in
    ``detect_threshold``. [#917]

- ``photutils.isophote``

  - Isophote central values and intensity gradients are now returned
    to the output table. [#892]

  - The ``EllipseSample`` ``update`` method now needs to know the
    fix/fit state of each individual parameter.  This can be passed to
    it via a ``Geometry`` instance, e.g., ``update(geometry.fix)``.
    [#922]

- ``photutils.psf``

  - ``FittableImageModel`` and subclasses now allow for different
    ``oversampling`` factors to be specified in the x and y
    directions. [#834]

  - Removed ``pixel_scale`` keyword from ``EPSFStar``, ``EPSFBuilder``,
    and ``EPSFModel``. [#815]

  - Added ``oversampling`` keyword to ``centroid_com``. [#816]

  - Removed deprecated ``Star``, ``Stars``, and ``LinkedStar``
    classes. [#894]

  - Removed ``recentering_boxsize`` and ``center_accuracy`` keywords
    and added ``norm_radius`` and ``shift_value`` keywords in
    ``EPSFBuilder``. [#817]

  - Added ``norm_radius`` and ``shift_value`` keywords to
    ``EPSFModel``. [#817]

- ``photutils.segmentation``

  - Removed deprecated ``SegmentationImage`` attributes
    ``data_masked``, ``max``, and ``is_sequential``  and methods
    ``area`` and ``relabel_sequential``. [#825]

  - Renamed ``SegmentationImage`` methods ``cmap`` (deprecated) to
    ``make_cmap`` and ``relabel`` (deprecated) to ``reassign_label``.
    The new ``reassign_label`` method gains a ``relabel`` keyword.
    [#825]

  - The ``SegmentationImage`` ``segments`` and ``slices`` attributes
    now have the same length as ``labels`` (no ``None`` placeholders).
    [#825]

  - ``detect_sources`` now returns ``None`` if no sources are found.
    Also, for this case a ``NoDetectionsWarning`` is issued. [#836]

  - The ``SegmentationImage`` input ``data`` array must contain at
    least one non-zero pixel and must not contain any non-finite values.
    [#836]

  - A ``ValueError`` is raised if an empty list is input into
    ``SourceCatalog`` or no valid sources are defined in
    ``source_properties``. [#836]

  - Deprecated the ``values`` and ``coords`` attributes in
    ``SourceProperties``. [#858]

  - Deprecated the unused ``mask_value`` keyword in
    ``make_source_mask``. [#858]

  - The ``bbox`` property now returns a ``BoundingBox`` instance.
    [#863]

  - The ``xmin/ymin`` and ``xmax/ymax`` properties have been
    deprecated with the replacements having a ``bbox_`` prefix (e.g.,
    ``bbox_xmin``). [#863]

  - The ``orientation`` property is now returned as a ``Quantity``
    instance in units of degrees. [#863]

  - Renamed the ``snr`` (deprecated) keyword to ``nsigma`` in
    ``make_source_mask``. [#917]

- ``photutils.utils``

  - Renamed ``random_cmap`` to ``make_random_cmap``. [#825]

  - Removed deprecated ``cutout_footprint`` function. [#835]

  - Deprecated the ``wcs_helpers`` functions
    ``pixel_scale_angle_at_skycoord``, ``assert_angle_or_pixel``,
    ``assert_angle``, and ``pixel_to_icrs_coords``. [#846]

  - Removed deprecated ``interpolate_masked_data`` function. [#895]

  - Deprecated the ``mask_to_mirrored_num`` function. [#895]

  - Deprecated the ``get_version_info``, ``filter_data``, and
    ``std_blocksum`` functions. [#918]


0.6 (2018-12-11)
----------------

General
^^^^^^^

- Versions of Numpy <1.11 are no longer supported. [#783]

New Features
^^^^^^^^^^^^

- ``photutils.detection``

  - ``DAOStarFinder`` and ``IRAFStarFinder`` gain two new parameters:
    ``brightest`` to keep the top ``brightest`` (based on the flux)
    objects in the returned catalog (after all other filtering has
    been applied) and ``peakmax`` to exclude sources with peak pixel
    values larger or equal to ``peakmax``. [#750]

  - Added a ``mask`` keyword to ``DAOStarFinder`` and
    ``IRAFStarFinder`` that can be used to mask regions of the input
    image.  [#759]

- ``photutils.psf``

  - The ``Star``, ``Stars``, and ``LinkedStars`` classes are now
    deprecated and have been renamed ``EPSFStar``, ``EPSFStars``, and
    ``LinkedEPSFStars``, respectively. [#727]

  - Added a ``GriddedPSFModel`` class for spatially-dependent PSFs.
    [#772]

  - The ``pixel_scale`` keyword in ``EPSFStar``, ``EPSFBuilder`` and
    ``EPSFModel`` is now deprecated.  Use the ``oversampling`` keyword
    instead. [#780]

API Changes
^^^^^^^^^^^

- ``photutils.detection``

  - The ``find_peaks`` function now returns an empty
    ``astropy.table.Table`` instead of an empty list if the input data
    is an array of constant values. [#709]

  - The ``find_peaks`` function will no longer issue a RuntimeWarning
    if the input data contains NaNs. [#712]

  - If no sources/peaks are found, ``DAOStarFinder``,
    ``IRAFStarFinder``, and ``find_peaks`` now will return an empty
    table with column names and types. [#758, #762]

- ``photutils.psf``

  - The ``photutils.psf.funcs.py`` module was renamed
    ``photutils.psf.utils.py``. The ``prepare_psf_model`` and
    ``get_grouped_psf_model`` functions were also moved to this new
    ``utils.py`` module.  [#777]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - If a single aperture is input as a list into the
    ``aperture_photometry`` function, then the output columns will be
    called ``aperture_sum_0`` and ``aperture_sum_err_0`` (if errors
    are used).  Previously these column names did not have the
    trailing "_0". [#779]

- ``photutils.segmentation``

  - Fixed a bug in the computation of ``sky_bbox_ul``,
    ``sky_bbox_lr``, ``sky_bbox_ur`` in the ``SourceCatalog``. [#716]

Other Changes and Additions
^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Updated background and detection functions that call
  ``astropy.stats.SigmaClip`` or ``astropy.stats.sigma_clipped_stats``
  to support both their ``iters`` (for astropy < 3.1) and ``maxiters``
  keywords. [#726]


0.5 (2018-08-06)
----------------

General
^^^^^^^

- Versions of Python <3.5 are no longer supported. [#702, #703]

- Versions of Numpy <1.10 are no longer supported. [#697, #703]

- Versions of Pytest <3.1 are no longer supported. [#702]

- ``pytest-astropy`` is now required to run the test suite. [#702, #703]

- The documentation build now uses the Sphinx configuration from
  ``sphinx-astropy`` rather than from ``astropy-helpers``. [#702]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - Added ``plot`` and ``to_aperture`` methods to ``BoundingBox``. [#662]

  - Added default theta value for elliptical and rectangular
    apertures. [#674]

- ``photutils.centroids``

  - Added a ``centroid_sources`` function to calculate centroid of
    many sources in a single image. [#656]

  - An n-dimensional array can now be input into the ``centroid_com``
    function. [#685]

- ``photutils.datasets``

  - Added a ``load_simulated_hst_star_image`` function to load a
    simulated HST WFC3/IR F160W image of stars. [#695]

- ``photutils.detection``

  - Added a ``centroid_func`` keyword to ``find_peaks``.  The
    ``subpixels`` keyword is now deprecated. [#656]

  - The ``find_peaks`` function now returns ``SkyCoord`` objects in
    the table instead of separate RA and Dec. columns. [#656]

  - The ``find_peaks`` function now returns an empty Table and issues
    a warning when no peaks are found. [#668]

- ``photutils.psf``

  - Added tools to build and fit an effective PSF (``EPSFBuilder`` and
    ``EPSFFitter``). [#695]

  - Added ``extract_stars`` function to extract cutouts of stars used
    to build an ePSF. [#695]

  - Added ``EPSFModel`` class to hold a fittable ePSF model. [#695]

- ``photutils.segmentation``

  - Added a ``mask`` keyword to the ``detect_sources`` function. [#621]

  - Renamed ``SegmentationImage`` ``max`` attribute to ``max_label``.
    ``max`` is deprecated. [#662]

  - Added a ``Segment`` class to hold the cutout image and properties
    of single labeled region (source segment). [#662]

  - Deprecated the ``SegmentationImage`` ``area`` method.  Instead,
    use the ``areas`` attribute. [#662]

  - Renamed ``SegmentationImage`` ``data_masked`` attribute to
    ``data_ma``.  ``data_masked`` is deprecated. [#662]

  - Renamed ``SegmentationImage`` ``is_sequential`` attribute to
    ``is_consecutive``.  ``is_sequential`` is deprecated. [#662]

  - Renamed ``SegmentationImage`` ``relabel_sequential`` attribute to
    ``relabel_consecutive``.  ``relabel_sequential`` is deprecated.
    [#662]

  - Added a ``missing_labels`` property to ``SegmentationImage``.
    [#662]

  - Added a ``check_labels`` method to ``SegmentationImage``.  The
    ``check_label`` method is deprecated. [#662]

- ``photutils.utils``

  - Deprecated the ``cutout_footprint`` function. [#656]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed a bug where quantity inputs to the aperture classes would
    sometimes fail. [#693]

- ``photutils.detection``

  - Fixed an issue in ``detect_sources`` where in some cases sources
    with a size less than ``npixels`` could be returned. [#663]

  - Fixed an issue in ``DAOStarFinder`` where in some cases a few too
    many sources could be returned. [#671]

- ``photutils.isophote``

  - Fixed a bug where isophote fitting would fail when the initial
    center was not specified for an image with an elongated aspect
    ratio. [#673]

- ``photutils.segmentation``

  - Fixed ``deblend_sources`` when other sources are in the
    neighborhood. [#617]

  - Fixed ``source_properties`` to handle the case where the data
    contain one or more NaNs. [#658]

  - Fixed an issue with ``deblend_sources`` where sources were not
    deblended where the data contain one or more NaNs. [#658]

  - Fixed the ``SegmentationImage`` ``areas`` attribute to not include
    the zero (background) label. [#662]

Other Changes and Additions
^^^^^^^^^^^^^^^^^^^^^^^^^^^

- ``photutils.isophote``

  - Corrected the units for isophote ``sarea`` in the documentation. [#657]


0.4 (2017-10-30)
----------------

General
^^^^^^^

- Dropped python 3.3 support. [#542]

- Dropped numpy 1.8 support. Minimal required version is now numpy
  1.9. [#542]

- Dropped support for astropy 1.x versions.  Minimal required version
  is now astropy 2.0. [#575]

- Dropped scipy 0.15 support.  Minimal required version is now scipy
  0.16. [#576]

- Explicitly require six as dependency. [#601]

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - Added ``BoundingBox`` class, used when defining apertures. [#481]

  - Apertures now have ``__repr__`` and ``__str__`` defined. [#493]

  - Improved plotting of annulus apertures using Bezier curves. [#494]

  - Rectangular apertures now use the true minimal bounding box. [#507]

  - Elliptical apertures now use the true minimal bounding box. [#508]

  - Added a ``to_sky`` method for pixel apertures. [#512]

- ``photutils.background``

  - Mesh rejection now also applies to pixels that are masked during
    sigma clipping. [#544]

- ``photutils.datasets``

  - Added new ``make_wcs`` and ``make_imagehdu`` functions. [#527]

  - Added new ``show_progress`` keyword to the ``load_*`` functions.
    [#590]

- ``photutils.isophote``

  - Added a new ``photutils.isophote`` subpackage to provide tools to
    fit elliptical isophotes to a galaxy image. [#532, #603]

- ``photutils.segmentation``

  - Added a ``cmap`` method to ``SegmentationImage`` to generate a
    random matplotlib colormap. [#513]

  - Added ``sky_centroid`` and ``sky_centroid_icrs`` source
    properties. [#592]

  - Added new source properties representing the sky coordinates of
    the bounding box corner vertices (``sky_bbox_ll``, ``sky_bbox_ul``
    ``sky_bbox_lr``, and ``sky_bbox_ur``). [#592]

  - Added new ``SourceCatalog`` class to hold the list of
    ``SourceProperties``. [#608]

  - The ``properties_table`` function is now deprecated.  Use the
    ``SourceCatalog.to_table()`` method instead. [#608]

- ``photutils.psf``

  - Uncertainties on fitted parameters are added to the final table. [#516]

  - Fitted results of any free parameter are added to the final table. [#471]

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - The ``ApertureMask`` ``apply()`` method has been renamed to
    ``multiply()``. [#481].

  - The ``ApertureMask`` input parameter was renamed from ``mask`` to
    ``data``. [#548]

  - Removed the ``pixelwise_errors`` keyword from
    ``aperture_photometry``. [#489]

- ``photutils.background``

  - The ``Background2D`` keywords ``exclude_mesh_method`` and
    ``exclude_mesh_percentile`` were removed in favor of a single
    keyword called ``exclude_percentile``. [#544]

  - Renamed ``BiweightMidvarianceBackgroundRMS`` to
    ``BiweightScaleBackgroundRMS``. [#547]

  - Removed the ``SigmaClip`` class.  ``astropy.stats.SigmaClip`` is
    a direct replacement. [#569]

- ``photutils.datasets``

  - The ``make_poisson_noise`` function was renamed to
    ``apply_poisson_noise``.  [#527]

  - The ``make_random_gaussians`` function was renamed to
    ``make_random_gaussians_table``.  The parameter ranges
    must now be input as a dictionary.  [#527]

  - The ``make_gaussian_sources`` function was renamed to
    ``make_gaussian_sources_image``. [#527]

  - The ``make_random_models`` function was renamed to
    ``make_random_models_table``. [#527]

  - The ``make_model_sources`` function was renamed to
    ``make_model_sources_image``. [#527]

  - The ``unit``, ``hdu``, ``wcs``, and ``wcsheader`` keywords in
    ``photutils.datasets`` functions were removed. [#527]

  - ``'photutils-datasets'`` was added as an optional ``location`` in
    the ``get_path`` function. This option is used as a fallback in
    case the ``'remote'`` location (astropy data server) fails.
    [#589]

- ``photutils.detection``

  - The ``daofind`` and ``irafstarfinder`` functions were removed.
    [#588]

- ``photutils.psf``

  - ``IterativelySubtractedPSFPhotometry`` issues a "no sources
    detected" warning only on the first iteration, if applicable.
    [#566]

- ``photutils.segmentation``

  - The ``'icrs_centroid'``, ``'ra_icrs_centroid'``, and
    ``'dec_icrs_centroid'`` source properties are deprecated and are no
    longer default columns returned by ``properties_table``. [#592]

  - The ``properties_table`` function now returns a ``QTable``. [#592]

- ``photutils.utils``

  - The ``background_color`` keyword was removed from the
    ``random_cmap`` function. [#528]

  - Deprecated unused ``interpolate_masked_data()``. [#526, #611]

Bug Fixes
^^^^^^^^^

- ``photutils.segmentation``

  - Fixed ``deblend_sources`` so that it correctly deblends multiple
    sources. [#572]

  - Fixed a bug in calculation of the ``sky_centroid_icrs`` (and
    deprecated ``icrs_centroid``) property where the incorrect pixel
    origin was being passed. [#592]

- ``photutils.utils``

  - Added a check that ``data`` and ``bkg_error`` have the same units
    in ``calc_total_error``. [#537]


0.3.2 (2017-03-31)
------------------

General
^^^^^^^

- Fixed file permissions in the released source distribution.


0.3.1 (2017-03-02)
------------------

General
^^^^^^^

- Dropped numpy 1.7 support. Minimal required version is now numpy
  1.8. [#327]

- ``photutils.datasets``

  - The ``load_*`` functions that use remote data now retrieve the
    data from ``data.astropy.org`` (the astropy data repository).
    [#472]

Bug Fixes
^^^^^^^^^

- ``photutils.background``

  - Fixed issue with ``Background2D`` with ``edge_method='pad'`` that
    occurred when unequal padding needed to be applied to each axis.
    [#498]

  - Fixed issue with ``Background2D`` that occurred when zero padding
    needed to apply along only one axis. [#500]

- ``photutils.geometry``

  - Fixed a bug in ``circular_overlap_grid`` affecting 32-bit machines
    that could cause errors circular aperture photometry. [#475]

- ``photutils.psf``

  - Fixed a bug in how ``FittableImageModel`` represents its center.
    [#460]

  -  Fix bug which modified user's input table when doing forced
     photometry. [#485]


0.3 (2016-11-06)
----------------

New Features
^^^^^^^^^^^^

- ``photutils.aperture``

  - Added new ``origin`` keyword to aperture ``plot`` methods. [#395]

  - Added new ``id`` column to ``aperture_photometry`` output table. [#446]

  - Added ``__len__`` method for aperture classes. [#446]

  - Added new ``to_mask`` method to ``PixelAperture`` classes. [#453]

  - Added new ``ApertureMask`` class to generate masks from apertures.
    [#453]

  - Added new ``mask_area()`` method to ``PixelAperture`` classes.
    [#453]

  - The ``aperture_photometry()`` function now accepts a list of
    aperture objects. [#454]

- ``photutils.background``

  - Added new ``MeanBackground``, ``MedianBackground``,
    ``MMMBackground``, ``SExtractorBackground``,
    ``BiweightLocationBackground``, ``StdBackgroundRMS``,
    ``MADStdBackgroundRMS``, and ``BiweightMidvarianceBackgroundRMS``
    classes. [#370]

  - Added ``axis`` keyword to new background classes. [#392]

  - Added new ``removed_masked``, ``meshpix_threshold``, and
    ``edge_method`` keywords for the 2D background classes. [#355]

  - Added new ``std_blocksum`` function. [#355]

  - Added new ``SigmaClip`` class. [#423]

  - Added new ``BkgZoomInterpolator`` and ``BkgIDWInterpolator``
    classes. [#437]

- ``photutils.datasets``

  - Added ``load_irac_psf`` function. [#403]

- ``photutils.detection``

  - Added new ``make_source_mask`` convenience function. [#355]

  - Added ``filter_data`` function. [#398]

  - Added ``DAOStarFinder`` and ``IRAFStarFinder`` as OOP interfaces for
    ``daofind`` and ``irafstarfinder``, respectively, which are now
    deprecated. [#379]

- ``photutils.psf``

  - Added ``BasicPSFPhotometry``, ``IterativelySubtractedPSFPhotometry``, and
    ``DAOPhotPSFPhotometry`` classes to perform PSF photometry in
    crowded fields. [#427]

  - Added ``DAOGroup`` and ``DBSCANGroup`` classes for grouping overlapping
    sources. [#369]

- ``photutils.psf_match``

  - Added ``create_matching_kernel`` and ``resize_psf`` functions.  Also,
    added ``CosineBellWindow``, ``HanningWindow``,
    ``SplitCosineBellWindow``, ``TopHatWindow``, and ``TukeyWindow``
    classes. [#403]

- ``photutils.segmentation``

  - Created new ``photutils.segmentation`` subpackage. [#442]

  - Added ``copy`` and ``area`` methods and an ``areas`` property to
    ``SegmentationImage``. [#331]

API Changes
^^^^^^^^^^^

- ``photutils.aperture``

  - Removed the ``effective_gain`` keyword from
    ``aperture_photometry``.  Users must now input the total error,
    which can be calculated using the ``calc_total_error`` function.
    [#368]

  - ``aperture_photometry`` now outputs a ``QTable``. [#446]

  - Renamed ``source_id`` keyword to ``indices`` in the aperture
    ``plot()`` method. [#453]

  - Added ``mask`` and ``unit`` keywords to aperture
    ``do_photometry()`` methods.  [#453]

- ``photutils.background``

  - For the background classes, the ``filter_shape`` keyword was
    renamed to ``filter_size``.  The ``background_low_res`` and
    ``background_rms_low_res`` class attributes were renamed to
    ``background_mesh`` and ``background_rms_mesh``, respectively.
    [#355, #437]

  - The ``Background2D`` ``method`` and ``backfunc`` keywords have
    been removed.  In its place one can input callable objects via the
    ``sigma_clip``, ``bkg_estimator``, and ``bkgrms_estimator``
    keywords. [#437]

  - The interpolator to be used by the ``Background2D`` class can be
    input as a callable object via the new ``interpolator`` keyword.
    [#437]

- ``photutils.centroids``

  - Created ``photutils.centroids`` subpackage, which contains the
    ``centroid_com``, ``centroid_1dg``, and ``centroid_2dg``
    functions.  These functions now return a two-element numpy
    ndarray.  [#428]

- ``photutils.detection``

  - Changed finding algorithm implementations (``daofind`` and
    ``starfind``) from functional to object-oriented style. Deprecated
    old style. [#379]

- ``photutils.morphology``

  - Created ``photutils.morphology`` subpackage. [#428]

  - Removed ``marginalize_data2d`` function. [#428]

  - Moved ``cutout_footprint`` from ``photutils.morphology`` to
    ``photutils.utils``. [#428]

  - Added a function to calculate the Gini coefficient (``gini``).
    [#343]

- ``photutils.psf``

  - Removed the ``effective_gain`` keyword from ``psf_photometry``.
    Users must now input the total error, which can be calculated
    using the ``calc_total_error`` function. [#368]

- ``photutils.segmentation``

  - Removed the ``effective_gain`` keyword from ``SourceProperties``
    and ``source_properties``.  Users must now input the total error,
    which can be calculated using the ``calc_total_error`` function.
    [#368]

- ``photutils.utils``

  - Renamed ``calculate_total_error`` to ``calc_total_error``. [#368]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed a bug in ``aperture_photometry`` so that single-row output
    tables do not return a multidimensional column. [#446]

- ``photutils.centroids``

  - Fixed a bug in ``centroid_1dg`` and ``centroid_2dg`` that occurred
    when the input data contained invalid (NaN or inf) values. [#428]

- ``photutils.segmentation``

  - Fixed a bug in ``SourceProperties`` where ``error`` and
    ``background`` units were sometimes dropped. [#441]


0.2.2 (2016-07-06)
------------------

General
^^^^^^^

- Dropped numpy 1.6 support. Minimal required version is now numpy
  1.7. [#327]

- Fixed configparser for Python 3.5. [#366, #384]

Bug Fixes
^^^^^^^^^

- ``photutils.detection``

  - Fixed an issue to update segmentation image slices after
    deblending. [#340]

  - Fixed source deblending to pass the pixel connectivity to the
    watershed algorithm. [#347]

  - SegmentationImage properties are now cached instead of recalculated,
    which significantly improves performance. [#361]

- ``photutils.utils``

  - Fixed a bug in ``pixel_to_icrs_coords`` where the incorrect pixel
    origin was being passed. [#348]


0.2.1 (2016-01-15)
------------------

Bug Fixes
^^^^^^^^^

- ``photutils.background``

  - Added more robust version checking of Astropy. [#318]

- ``photutils.detection``

  - Added more robust version checking of Astropy. [#318]

- ``photutils.segmentation``

  - Fixed issue where ``SegmentationImage`` slices were not being updated.
    [#317]

  - Added more robust version checking of scikit-image. [#318]


0.2 (2015-12-31)
----------------

General
^^^^^^^

- Photutils has the following requirements:

  - Python 2.7 or 3.3 or later

  - Numpy 1.6 or later

  - Astropy v1.0 or later

New Features
^^^^^^^^^^^^

- ``photutils.detection``

  - ``find_peaks`` now returns an Astropy Table containing the (x, y)
    positions and peak values. [#240]

  - ``find_peaks`` has new ``mask``, ``error``, ``wcs`` and ``subpixel``
    precision options. [#244]

  - ``detect_sources`` will now issue a warning if the filter kernel
    is not normalized to 1. [#298]

  - Added new ``deblend_sources`` function, an experimental source
    deblender. [#314]

- ``photutils.morphology``

  - Added new ``GaussianConst2D`` (2D Gaussian plus a constant) model.
    [#244]

  - Added new ``marginalize_data2d`` function. [#244]

  - Added new ``cutout_footprint`` function. [#244]

- ``photutils.segmentation``

  - Added new ``SegmentationImage`` class. [#306]

  - Added new ``check_label``, ``keep_labels``, and ``outline_segments``
    methods for modifying ``SegmentationImage``. [#306]

- ``photutils.utils``

  - Added new ``random_cmap`` function to generate a colormap comprised
    of random colors. [#299]

  - Added new ``ShepardIDWInterpolator`` class to perform Inverse
    Distance Weighted (IDW) interpolation. [#307]

  - The ``interpolate_masked_data`` function can now interpolate
    higher-dimensional data. [#310]

API Changes
^^^^^^^^^^^

- ``photutils.segmentation``

  - The ``relabel_sequential``, ``relabel_segments``,
    ``remove_segments``, ``remove_border_segments``, and
    ``remove_masked_segments`` functions are now ``SegmentationImage``
    methods (with slightly different names). [#306]

  - The ``SegmentProperties`` class has been renamed to
    ``SourceProperties``.  Likewise, the ``segment_properties``
    function has been renamed to ``source_properties``. [#306]

  - The ``segment_sum`` and ``segment_sum_err`` attributes have been
    renamed to ``source_sum`` and ``source_sum_err``, respectively. [#306]

  - The ``background_atcentroid`` attribute has been renamed to
    ``background_at_centroid``. [#306]

Bug Fixes
^^^^^^^^^

- ``photutils.aperture``

  - Fixed an issue where ``np.nan`` or ``np.inf`` were not properly
    masked. [#267]

- ``photutils.geometry``

  - ``overlap_area_triangle_unit_circle`` handles correctly a corner case
    in some i386 systems where the area of the aperture was not computed
    correctly. [#242]

  - ``rectangular_overlap_grid`` and ``elliptical_overlap_grid`` fixes to
    normalization of subsampled pixels. [#265]

  - ``overlap_area_triangle_unit_circle`` handles correctly the case where
    a line segment intersects at a triangle vertex. [#277]

Other Changes and Additions
^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Updated astropy-helpers to v1.1. [#302]


0.1 (2014-12-22)
----------------

Photutils 0.1 was released on December 22, 2014.  It requires Astropy
version 0.4 or later.
