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"optimize" default when saving GIF images #7570

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Nov 25, 2023
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"optimize" default when saving GIF images #7570

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c855584
Corrected "optimize" default when saving GIF images
radarhere Nov 25, 2023
f59b51f
Simplified code
radarhere Nov 25, 2023
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9 changes: 6 additions & 3 deletions docs/handbook/image-file-formats.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -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.
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2 changes: 1 addition & 1 deletion src/PIL/GifImagePlugin.py
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Expand Up @@ -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)
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