10.0.0
------

Backwards Incompatible Changes
==============================

32-bit support
^^^^^^^^^^^^^^

32-bit architecture is no longer supported and 32-bit wheels are no longer provided.

Categories
^^^^^^^^^^

``im.category`` has been removed, along with the related ``Image.NORMAL``,
``Image.SEQUENCE`` and ``Image.CONTAINER`` attributes.

To determine if an image has multiple frames or not,
``getattr(im, "is_animated", False)`` can be used instead.

Tk/Tcl 8.4
^^^^^^^^^^

Support for Tk/Tcl 8.4 has been removed.

JpegImagePlugin.convert_dict_qtables
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Since deprecation in Pillow 8.3.0, the ``convert_dict_qtables`` method no longer
performed any operations on the data given to it, and has been removed.

ImagePalette size parameter
^^^^^^^^^^^^^^^^^^^^^^^^^^^

Before Pillow 8.3.0, ``ImagePalette`` required palette data of particular lengths by
default, and the ``size`` parameter could be used to override that. Pillow 8.3.0
removed the default required length, also removing the need for the ``size`` parameter.

ImageShow.Viewer.show_file file argument
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The ``file`` argument in :py:meth:`~PIL.ImageShow.Viewer.show_file()` has been
removed and replaced by ``path``.

In effect, ``viewer.show_file("test.jpg")`` will continue to work unchanged.

Constants
^^^^^^^^^

A number of constants have been removed.
Instead, ``enum.IntEnum`` classes have been added.

=====================================================  ============================================================
Removed                                                Use instead
=====================================================  ============================================================
``Image.LINEAR``                                       ``Image.BILINEAR`` or ``Image.Resampling.BILINEAR``
``Image.CUBIC``                                        ``Image.BICUBIC`` or ``Image.Resampling.BICUBIC``
``Image.ANTIALIAS``                                    ``Image.LANCZOS`` or ``Image.Resampling.LANCZOS``
``ImageCms.INTENT_PERCEPTUAL``                         ``ImageCms.Intent.PERCEPTUAL``
``ImageCms.INTENT_RELATIVE_COLORMETRIC``               ``ImageCms.Intent.RELATIVE_COLORMETRIC``
``ImageCms.INTENT_SATURATION``                         ``ImageCms.Intent.SATURATION``
``ImageCms.INTENT_ABSOLUTE_COLORIMETRIC``              ``ImageCms.Intent.ABSOLUTE_COLORIMETRIC``
``ImageCms.DIRECTION_INPUT``                           ``ImageCms.Direction.INPUT``
``ImageCms.DIRECTION_OUTPUT``                          ``ImageCms.Direction.OUTPUT``
``ImageCms.DIRECTION_PROOF``                           ``ImageCms.Direction.PROOF``
``ImageFont.LAYOUT_BASIC``                             ``ImageFont.Layout.BASIC``
``ImageFont.LAYOUT_RAQM``                              ``ImageFont.Layout.RAQM``
``BlpImagePlugin.BLP_FORMAT_JPEG``                     ``BlpImagePlugin.Format.JPEG``
``BlpImagePlugin.BLP_ENCODING_UNCOMPRESSED``           ``BlpImagePlugin.Encoding.UNCOMPRESSED``
``BlpImagePlugin.BLP_ENCODING_DXT``                    ``BlpImagePlugin.Encoding.DXT``
``BlpImagePlugin.BLP_ENCODING_UNCOMPRESSED_RAW_RGBA``  ``BlpImagePlugin.Encoding.UNCOMPRESSED_RAW_RGBA``
``BlpImagePlugin.BLP_ALPHA_ENCODING_DXT1``             ``BlpImagePlugin.AlphaEncoding.DXT1``
``BlpImagePlugin.BLP_ALPHA_ENCODING_DXT3``             ``BlpImagePlugin.AlphaEncoding.DXT3``
``BlpImagePlugin.BLP_ALPHA_ENCODING_DXT5``             ``BlpImagePlugin.AlphaEncoding.DXT5``
``FtexImagePlugin.FORMAT_DXT1``                        ``FtexImagePlugin.Format.DXT1``
``FtexImagePlugin.FORMAT_UNCOMPRESSED``                ``FtexImagePlugin.Format.UNCOMPRESSED``
``PngImagePlugin.APNG_DISPOSE_OP_NONE``                ``PngImagePlugin.Disposal.OP_NONE``
``PngImagePlugin.APNG_DISPOSE_OP_BACKGROUND``          ``PngImagePlugin.Disposal.OP_BACKGROUND``
``PngImagePlugin.APNG_DISPOSE_OP_PREVIOUS``            ``PngImagePlugin.Disposal.OP_PREVIOUS``
``PngImagePlugin.APNG_BLEND_OP_SOURCE``                ``PngImagePlugin.Blend.OP_SOURCE``
``PngImagePlugin.APNG_BLEND_OP_OVER``                  ``PngImagePlugin.Blend.OP_OVER``
=====================================================  ============================================================

FitsStubImagePlugin
^^^^^^^^^^^^^^^^^^^

The stub image plugin ``FitsStubImagePlugin`` has been removed.
FITS images can be read without a handler through :mod:`~PIL.FitsImagePlugin` instead.

Font size and offset methods
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Several functions for computing the size and offset of rendered text have been removed:

=============================================================== =============================================================================================================
Removed                                                         Use instead
=============================================================== =============================================================================================================
``FreeTypeFont.getsize()`` and ``FreeTypeFont.getoffset()``     :py:meth:`.FreeTypeFont.getbbox` and :py:meth:`.FreeTypeFont.getlength`
``FreeTypeFont.getsize_multiline()``                            :py:meth:`.ImageDraw.multiline_textbbox`
``ImageFont.getsize()``                                         :py:meth:`.ImageFont.getbbox` and :py:meth:`.ImageFont.getlength`
``TransposedFont.getsize()``                                    :py:meth:`.TransposedFont.getbbox` and :py:meth:`.TransposedFont.getlength`
``ImageDraw.textsize()`` and ``ImageDraw.multiline_textsize()`` :py:meth:`.ImageDraw.textbbox`, :py:meth:`.ImageDraw.textlength` and :py:meth:`.ImageDraw.multiline_textbbox`
``ImageDraw2.Draw.textsize()``                                  :py:meth:`.ImageDraw2.Draw.textbbox` and :py:meth:`.ImageDraw2.Draw.textlength`
=============================================================== =============================================================================================================

FreeTypeFont.getmask2 fill parameter
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The undocumented ``fill`` parameter of :py:meth:`.FreeTypeFont.getmask2` has been
removed.

PhotoImage.paste box parameter
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The ``box`` parameter was unused and has been removed.

PyQt5 and PySide2
^^^^^^^^^^^^^^^^^

`Qt 5 reached end-of-life <https://www.qt.io/blog/qt-5.15-released>`_ on 2020-12-08 for
open-source users (and will reach EOL on 2023-12-08 for commercial licence holders).

Support for PyQt5 and PySide2 has been removed from ``ImageQt``. Upgrade to
`PyQt6 <https://www.riverbankcomputing.com/static/Docs/PyQt6/>`_ or
`PySide6 <https://doc.qt.io/qtforpython-6/>`_ instead.

Image.coerce_e
^^^^^^^^^^^^^^

This undocumented method has been removed.

Deprecations
============

TODO
^^^^

TODO

API Changes
===========

Added line width parameter to ImageDraw regular_polygon
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

An optional line ``width`` parameter has been added to
``ImageDraw.Draw.regular_polygon``.

API Additions
=============

TODO
^^^^

TODO

Security
========

TODO
^^^^

TODO

Other Changes
=============

Support display_jpeg() in IPython
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

In addition to ``display()`` and ``display_png``, ``display_jpeg()`` can now
also be used to display images in IPython::

    from PIL import Image
    from IPython.display import display_jpeg

    im = Image.new("RGB", (100, 100), (255, 0, 0))
    display_jpeg(im)

Support reading signed 8-bit TIFF images
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

TIFF images with signed integer data, 8 bits per sample and a photometric
interpretaton of BlackIsZero can now be read.