Allow putpalette to accept 1024 integers to include alpha values #5089
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This was referenced Mar 8, 2021
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Resolves #4941
At the moment,
Image.putpalettecan only accept 256 RGB values. As the issue found, this means that alpha values cannot be included. This PR allows 256 RGBA values as well, by stripping out every 4th value forinfo["transparency"]inload().