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Merge pull request #7636 from bgilbert/jp2-docs

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Document JPEG 2000 support for writing YCbCr and reading subsampled color
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docs/handbook/image-file-formats.rst
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@ -552,12 +552,13 @@ JPEG 2000
.. versionadded:: 2.4.0 .. versionadded:: 2.4.0
Pillow reads and writes JPEG 2000 files containing ``L``, ``LA``, ``RGB`` or Pillow reads and writes JPEG 2000 files containing ``L``, ``LA``, ``RGB``,
``RGBA`` data. It can also read files containing ``YCbCr`` data, which it ``RGBA``, or ``YCbCr`` data. When reading, ``YCbCr`` data is converted to
converts on read into ``RGB`` or ``RGBA`` depending on whether or not there is ``RGB`` or ``RGBA`` depending on whether or not there is an alpha channel.
an alpha channel. Pillow supports JPEG 2000 raw codestreams (``.j2k`` files), Beginning with version 8.3.0, Pillow can read (but not write) ``RGB``,
as well as boxed JPEG 2000 files (``.j2p`` or ``.jpx`` files). Pillow does ``RGBA``, and ``YCbCr`` images with subsampled components. Pillow supports
*not* support files whose components have different sampling frequencies. JPEG 2000 raw codestreams (``.j2k`` files), as well as boxed JPEG 2000 files
(``.jp2`` or ``.jpx`` files).
When loading, if you set the ``mode`` on the image prior to the When loading, if you set the ``mode`` on the image prior to the
:py:meth:`~PIL.Image.Image.load` method being invoked, you can ask Pillow to :py:meth:`~PIL.Image.Image.load` method being invoked, you can ask Pillow to