Improved handling of RGBA palettes when saving GIF images#8366
Merged
hugovk merged 1 commit intopython-pillow:mainfrom Sep 10, 2024
Merged
Improved handling of RGBA palettes when saving GIF images#8366hugovk merged 1 commit intopython-pillow:mainfrom
hugovk merged 1 commit intopython-pillow:mainfrom
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Resolves #8222
In the issue, two RGBA images are saved together in the GIF format. However, the transparent background is (0, 0, 0, 0) and (0, 0, 0) is also re-used at different opacities within the image. When GifImagePlugin tries to optimise the image by utilising
remap_palette()to group multiple colours together, it doesn't consider the A channel, and so an unexpected result occurs, where the colour information for the bottom line of the second image is lost, and then cropped out.By improving the detection of RGBA palettes, this is fixed.