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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.
**optimize**
If present and true, attempt to compress the palette by
eliminating unused colors. This is only useful if the palette can
be compressed to the next smaller power of 2 elements.
Whether to attempt to compress the palette by eliminating unused colors.
This is attempted by default, unless a palette is specified as an option or
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
the following properties in its :py:attr:`~PIL.Image.Image.info` dictionary.

2
src/PIL/GifImagePlugin.py
View File

@ -656,7 +656,7 @@ def _save(im, fp, filename, save_all=False):
palette = im.encoderinfo.get("palette", im.info.get("palette"))
else:
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):
_write_single_frame(im, fp, palette)