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66 lines
2.0 KiB
ReStructuredText
66 lines
2.0 KiB
ReStructuredText
3.4.0
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-----
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Backwards Incompatible Changes
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==============================
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Image.core.open_ppm removed
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The nominally private/debugging function ``Image.core.open_ppm`` has
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been removed. If you were using this function, please use
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``Image.open`` instead.
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Deprecations
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============
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Deprecation Warning when Saving JPEGs
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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JPEG images cannot contain an alpha channel. Pillow prior to 3.4.0
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silently drops the alpha channel. With this release Pillow will now
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issue a :py:exc:`DeprecationWarning` when attempting to save a ``RGBA`` mode
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image as a JPEG. This will become an error in Pillow 4.2.
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API Additions
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=============
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New resizing filters
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^^^^^^^^^^^^^^^^^^^^
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Two new filters available for ``Image.resize()`` and ``Image.thumbnail()``
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functions: ``BOX`` and ``HAMMING``. ``BOX`` is the high-performance filter with
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two times shorter window than ``BILINEAR``. It can be used for image reduction
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3 and more times and produces a sharper result than ``BILINEAR``.
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``HAMMING`` filter has the same performance as ``BILINEAR`` filter while
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providing the image downscaling quality comparable to ``BICUBIC``.
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Both new filters don't show good quality for the image upscaling.
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New DDS Decoders
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^^^^^^^^^^^^^^^^
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Pillow can now decode DXT3 images, as well as the previously supported
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DXT1 and DXT5 formats. All three formats are now decoded in C code for
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better performance.
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Append images to GIF
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^^^^^^^^^^^^^^^^^^^^
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Additional frames can now be appended when saving a GIF file, through the
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``append_images`` argument. The new frames are passed in as a list of images,
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which may be have multiple frames themselves.
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Note that the ``append_images`` argument is only used if ``save_all`` is also
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in effect, e.g.::
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im.save(out, save_all=True, append_images=[im1, im2, ...])
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Save multiple frame TIFF
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^^^^^^^^^^^^^^^^^^^^^^^^
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Multiple frames can now be saved in a TIFF file by using the ``save_all`` option.
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e.g.::
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im.save("filename.tiff", format="TIFF", save_all=True)
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