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89 lines
3.1 KiB
ReStructuredText
89 lines
3.1 KiB
ReStructuredText
4.1.0
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-----
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Deprecations
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============
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Several deprecated items have been removed.
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* Support for spaces in tiff kwargs in the parameters for 'x resolution', 'y
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resolution', 'resolution unit', and 'date time' has been
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removed. Underscores should be used instead.
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* The methods ``PIL.ImageDraw.ImageDraw.setink``,
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``PIL.ImageDraw.ImageDraw.setfill``, and
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``PIL.ImageDraw.ImageDraw.setfont`` have been removed.
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Other changes
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=============
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Closing files when opening images
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The file handling when opening images has been overhauled. Previously,
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Pillow would attempt to close some, but not all image formats
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after loading the image data. Now, the following behavior
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is specified:
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* For images where an open file is passed in, it is the
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responsibility of the calling code to close the file.
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* For images where Pillow opens the file and the file is known to have
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only one frame, the file is closed after loading.
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* If the file has more than one frame, or if it can't be determined,
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then the file is left open to permit seeking to subsequent
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frames. It will be closed, eventually, in the ``close`` or
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``__del__`` methods.
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* If the image is memory mapped, then we can't close the mapping to
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the underlying file until we are done with the image. The mapping
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will be closed in the ``close`` or ``__del__`` method.
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Changes to GIF handling when saving
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The :py:class:`PIL.GifImagePlugin` code has been refactored to fix the flow when
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saving images. There are two external changes that arise from this:
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* An :py:class:`PIL.ImagePalette.ImagePalette` object is now accepted
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as a specified palette argument in :py:meth:`PIL.Image.Image.save()`.
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* The image to be saved is no longer modified in place by any of the
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operations of the save function. Previously it was modified when
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optimizing the image palette.
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This refactor fixed some bugs with palette handling when saving
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multiple frame GIFs.
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New method: Image.remap_palette
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The method :py:meth:`PIL.Image.Image.remap_palette()` has been
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added. This method was hoisted from the GifImagePlugin code used to
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optimize the palette.
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Added decoder registry and support for Python-based decoders
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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There is now a decoder registry similar to the image plugin
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registries. Image plugins can register a decoder, and it will be
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called when the decoding is requested. This allows for the creation of
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pure Python decoders. While the Python decoders will not be as fast as
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their C based counterparts, they may be easier and quicker to develop
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or safer to run.
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Tests
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^^^^^
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Many tests have been added, including correctness tests for image
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formats that have been previously untested.
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We are now running automated tests in Docker containers against more
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Linux versions than are provided on Travis CI, which is currently
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Ubuntu 14.04 x64. This Pillow release is tested on 64-bit Alpine,
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Arch, Ubuntu 12.04 and 16.04, and 32-bit Debian Stretch and Ubuntu
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14.04. This also covers a wider range of dependency versions than are
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provided on Travis natively.
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