Ensure palette string matches RGB mode #5549
Merged
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Resolves #4830
The image from that issue has a BGR;15 palette. So when PngImagePlugin tries to calculate the number of colors to use when saving for
show()
,Pillow/src/PIL/PngImagePlugin.py
Line 1195 in 384a4bf
the assumption, that it can divide by 3 because this is RGB, is false.
This PR adds a change to Image, so that when it sets the palette mode to RGB, there is actually RGB data in the palette string.