Error handling for unsupported transparency #14956
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When input images (palette mode) have transparency (bytes) in info, the output images (RGB mode) will inherit it, causing ValueError in Pillow:PIL/PngImagePlugin.py#1364 when trying to unpack this bytes. This commit check the PNG mode and transparency info, removing transparency if it's RGB mode and transparency is bytes
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Description
When input images (palette mode) have transparency (bytes) in info, the output images (RGB mode) will inherit it, causing ValueError in Pillow:PIL/PngImagePlugin.py#1364 when trying to unpack this bytes.
This commit check the PNG mode and transparency info, removing transparency if it's RGB mode and transparency is bytes
Reproduce
Test file
Screenshots/videos:
Before
After
Checklist: