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52 lines
1.6 KiB
ReStructuredText
52 lines
1.6 KiB
ReStructuredText
3.3.0
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-----
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Libimagequant support
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^^^^^^^^^^^^^^^^^^^^^
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There is now support for using libimagequant as a higher quality
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quantization option in ``Image.quantize()`` on Unix-like
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platforms. This support requires building Pillow from source against
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libimagequant. We cannot distribute binaries due to licensing
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differences.
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New Setup.py options
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^^^^^^^^^^^^^^^^^^^^
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There are two new options to control the ``build_ext`` task in ``setup.py``:
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* ``--debug`` dumps all of the directories and files that are
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checked when searching for libraries or headers when building the
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extensions.
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* ``--disable-platform-guessing`` removes many of the directories
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that are checked for libraries and headers for build systems or
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cross compilers that specify that information in via environment
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variables.
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Resizing
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^^^^^^^^
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Image resampling for 8-bit per channel images was rewritten using only integer
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computings. This is faster on most platforms and doesn't introduce precision
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errors on the wide range of scales. With other performance improvements, this
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makes resampling 60% faster on average.
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Color calculation for images in the ``LA`` mode on semitransparent pixels
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was fixed.
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Rotation
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^^^^^^^^
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Rotation for angles divisible by 90 degrees now always uses transposition.
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This greatly improves both quality and performance in this case.
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Also, the bug with wrong image size calculation when rotating by 90 degrees
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was fixed.
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Image Metadata
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^^^^^^^^^^^^^^
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The return type for binary data in version 2 Exif and Tiff metadata
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has been changed from a tuple of integers to bytes. This is a change
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from the behavior since 3.0.0.
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