Ensure image is opaque after converting P to PA with RGB palette #6052
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When converting P to PA, Pillow currently sets the A value from the palette.
Pillow/src/libImaging/Convert.c
Lines 1029 to 1039 in cac305f
If the palette is in RGBA mode, that makes sense. However, if the palette is in RGB mode, then that doesn't make sense, and leads to this.
out.tiff.zip
Instead, this PR checks the palette mode, and fills the alpha channel with 255 if the palette is RGB.