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55 lines
1.7 KiB
ReStructuredText
55 lines
1.7 KiB
ReStructuredText
4.3.0
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-----
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Get One Channel From Image
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==========================
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New method :py:meth:`PIL.Image.Image.getchannel` added.
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It returns single channel by index or name. For example,
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``image.getchannel("A")`` will return alpha channel as separate image.
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``getchannel`` should work up to 6 times faster than ``image.split()[0]``
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in previous Pillow versions.
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Partial Resampling
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==================
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Added new argument ``box`` for :py:meth:`PIL.Image.Image.resize`. This
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argument defines a source rectangle from within the source image to be
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resized. This is very similar to the ``image.crop(box).resize(size)``
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sequence except that ``box`` can be specified with subpixel accuracy.
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Loading 16-bit TIFF Images
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==========================
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Pillow now can read 16-bit multichannel TIFF files including files
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with alpha transparency. The image data is truncated to 8-bit
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precision.
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Performance
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===========
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This release contains several performance improvements:
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* Many memory bandwidth-bounded operations such as crop, image allocation,
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conversion, split into bands and merging from bands are up to 2x faster.
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* Upscaling of multichannel images (such as RGB) is accelerated by 5-10%
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* JPEG loading is accelerated up to 15% and JPEG saving up to 20% when
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using a recent version of libjpeg-turbo.
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Core Image API Changes
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======================
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These are internal functions that should not have been used by user
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code, but they were accessible from the python layer.
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Debugging code within ``Image.core.grabclipboard`` was removed. It had been
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marked as ``will be removed in future versions`` since PIL. When enabled, it
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identified the format of the clipboard data.
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The ``PIL.Image.core.copy`` and ``PIL.Image.Image.im.copy2`` methods
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have been removed.
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