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114 lines
3.9 KiB
ReStructuredText
114 lines
3.9 KiB
ReStructuredText
8.3.0
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-----
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Deprecations
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============
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JpegImagePlugin.convert_dict_qtables
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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JPEG ``quantization`` is now automatically converted, but still returned as a
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dictionary. The :py:attr:`~PIL.JpegImagePlugin.convert_dict_qtables` method no longer
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performs any operations on the data given to it, has been deprecated and will be
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removed in Pillow 10.0.0 (2023-01-02).
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API Changes
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===========
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Changed WebP default "method" value when saving
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Previously, it was 0, for the best speed. The default has now been changed to 4, to
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match WebP's default, for higher quality with still some speed optimisation.
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Default resampling filter for special image modes
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Pillow 7.0 changed the default resampling filter to ``Image.BICUBIC``. However, as this
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is not supported yet for images with a custom number of bits, the default filter for
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those modes has been reverted to ``Image.NEAREST``.
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ImageMorph incorrect mode errors
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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For ``apply()``, ``match()`` and ``get_on_pixels()``, if the image mode is not L, an
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:py:exc:`Exception` was thrown. This has now been changed to a :py:exc:`ValueError`.
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getxmp()
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^^^^^^^^
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`XMP data <https://en.wikipedia.org/wiki/Extensible_Metadata_Platform>`_ can now be
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returned for PNG and TIFF images, through ``getxmp()`` for each format.
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The returned dictionary will start from the base of the XML, meaning that the top level
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should contain an "xmpmeta" key. JPEG's ``getxmp()`` method has also been updated to
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this structure.
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TIFF getexif()
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^^^^^^^^^^^^^^
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TIFF :py:attr:`~PIL.TiffImagePlugin.TiffImageFile.tag_v2` data can now be accessed
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through :py:meth:`~PIL.Image.Image.getexif`. This also provides access to the GPS and
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EXIF IFDs, through ``im.getexif().get_ifd(0x8825)`` and
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``im.getexif().get_ifd(0x8769)`` respectively.
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API Additions
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=============
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ImageOps.contain
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^^^^^^^^^^^^^^^^
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Returns a resized version of the image, set to the maximum width and height within
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``size``, while maintaining the original aspect ratio.
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To compare it to other ImageOps methods:
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- :py:meth:`~PIL.ImageOps.fit` expands an image until is fills ``size``, cropping the
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parts of the image that do not fit.
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- :py:meth:`~PIL.ImageOps.pad` expands an image to fill ``size``, without cropping, but
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instead filling the extra space with ``color``.
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- :py:meth:`~PIL.ImageOps.contain` is similar to :py:meth:`~PIL.ImageOps.pad`, but it
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does not fill the extra space. Instead, the original aspect ratio is maintained. So
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unlike the other two methods, it is not guaranteed to return an image of ``size``.
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ICO saving: bitmap_format argument
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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By default, Pillow saves ICO files in the PNG format. They can now also be saved in BMP
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format, through the new ``bitmap_format`` argument::
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im.save("out.ico", bitmap_format="bmp")
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Security
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========
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Buffer overflow
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^^^^^^^^^^^^^^^
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This release addresses :cve:`CVE-2021-34552`. PIL since 1.1.4 and Pillow since 1.0
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allowed parameters passed into a convert function to trigger buffer overflow in
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Convert.c.
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Parsing XML
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^^^^^^^^^^^
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Pillow previously parsed XMP data using Python's ``xml`` module. However, this module
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is not secure.
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- :py:meth:`~PIL.Image.Image.getexif` has used ``xml`` to potentially retrieve
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orientation data since Pillow 7.2.0. It has been refactored to use ``re`` instead.
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- :py:meth:`~PIL.JpegImagePlugin.JpegImageFile.getxmp` was added in Pillow 8.2.0. It
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will now use ``defusedxml`` instead. If the dependency is not present, an empty
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dictionary will be returned and a warning raised.
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Other Changes
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=============
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Added DDS BC5 reading and uncompressed saving
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Support has been added to read the BC5 format of DDS images, whether UNORM, SNORM or
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TYPELESS.
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Support has also been added to write the uncompressed format of DDS images.
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