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56 lines
1.8 KiB
ReStructuredText
56 lines
1.8 KiB
ReStructuredText
4.2.0
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-----
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Backwards Incompatible Changes
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==============================
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Several deprecated items have been removed
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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* The methods ``PIL.ImageWin.Dib.fromstring``,
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``PIL.ImageWin.Dib.tostring`` and
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``PIL.TiffImagePlugin.ImageFileDirectory_v2.as_dict`` have
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been removed.
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* Before Pillow 4.2.0, attempting to save an RGBA image as JPEG would
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discard the alpha channel. From Pillow 3.4.0, a deprecation warning
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was shown. From Pillow 4.2.0, the deprecation warning is removed and
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an :py:exc:`IOError` is raised.
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Removed Core Image Function
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The unused function ``Image.core.new_array`` was removed. This is an
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internal function that should not have been used by user code, but it
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was accessible from the python layer.
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Other Changes
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=============
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Added Complex Text Rendering
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Pillow now supports complex text rendering for scripts requiring glyph
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composition and bidirectional flow. This optional feature adds three
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dependencies: harfbuzz, fribidi, and raqm. See the :doc:`install documentation
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<../installation>` for further details. This feature is tested and works on
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Unix and Mac, but has not yet been built on Windows platforms.
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New Optional Parameters
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^^^^^^^^^^^^^^^^^^^^^^^
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* :py:meth:`PIL.ImageDraw.floodfill` has a new optional parameter:
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threshold. This specifies a tolerance for the color to replace with
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the flood fill.
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* The TIFF and PDF image writers now support the ``append_images``
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optional parameter for specifying additional images to create
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multipage outputs.
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New DecompressionBomb Warning
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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:py:meth:`PIL.Image.Image.crop` now may raise a DecompressionBomb
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warning if the crop region enlarges the image over the threshold
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specified by :py:data:`PIL.Image.MAX_IMAGE_PIXELS`.
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