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Merge pull request #7570 from radarhere/gif_optimize

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"optimize" default when saving GIF images
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Hugo van Kemenade 2023-11-25 10:03:00 +02:00 committed by GitHub
commit 7070feccb7
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2 changed files with 7 additions and 4 deletions
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9
docs/handbook/image-file-formats.rst
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@ -266,9 +266,12 @@ following options are available::
:py:class:`PIL.ImagePalette.ImagePalette` object. :py:class:`PIL.ImagePalette.ImagePalette` object.
**optimize** **optimize**
If present and true, attempt to compress the palette by Whether to attempt to compress the palette by eliminating unused colors.
eliminating unused colors. This is only useful if the palette can This is attempted by default, unless a palette is specified as an option or
be compressed to the next smaller power of 2 elements. as part of the first image's :py:attr:`~PIL.Image.Image.info` dictionary.
This is only useful if the palette can be compressed to the next smaller
power of 2 elements.
Note that if the image you are saving comes from an existing GIF, it may have Note that if the image you are saving comes from an existing GIF, it may have
the following properties in its :py:attr:`~PIL.Image.Image.info` dictionary. the following properties in its :py:attr:`~PIL.Image.Image.info` dictionary.

2
src/PIL/GifImagePlugin.py
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@ -656,7 +656,7 @@ def _save(im, fp, filename, save_all=False):
palette = im.encoderinfo.get("palette", im.info.get("palette")) palette = im.encoderinfo.get("palette", im.info.get("palette"))
else: else:
palette = None palette = None
im.encoderinfo["optimize"] = im.encoderinfo.get("optimize", True) im.encoderinfo.setdefault("optimize", True)
if not save_all or not _write_multiple_frames(im, fp, palette): if not save_all or not _write_multiple_frames(im, fp, palette):
_write_single_frame(im, fp, palette) _write_single_frame(im, fp, palette)