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Document alpha values of PA image with RGBA palette #6658

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Yay295 opened this issue Oct 12, 2022 · 4 comments · Fixed by #6662
Closed

Document alpha values of PA image with RGBA palette #6658

Yay295 opened this issue Oct 12, 2022 · 4 comments · Fixed by #6662
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@Yay295
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Yay295 commented Oct 12, 2022

I think the PA alpha is used regardless of any alpha values in the palette, but I'm not certain that's handled consistently, and I don't think it's documented anywhere.
@radarhere
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I'm not certain that's handled consistently

Are there any specific operations that you're concerned about? If not, ok.

@Yay295
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Yay295 commented Oct 12, 2022

Nothing specific. I don't think it's checked in very many places anyways.

@radarhere radarhere mentioned this issue Oct 13, 2022
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@radarhere
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I've created PR #6662 to document that when converting PA with an RGBA palette, the image channel will be used as the source of the alpha. Does that resolve this then?

@Yay295
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Yay295 commented Oct 13, 2022

Yeah, I think that should be good.

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Image channel is used when converting PA with an RGBA palette radarhere/Pillow
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@radarhere @Yay295