Fixed calling putpalette() on L and LA images before load() #7187
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Address the problem raised in #7186
putpalette()'s strategy for attaching a palette to an image is to change the mode, set the palette, and then callload().Pillow/src/PIL/Image.py
Lines 1918 to 1921 in 117618b
We have been testing this with all of the valid modes.
However, the user found an error when calling
putpalette()on an image directly after opening it, beforeload()is called. This means that L and LA images are attempted to be unpacked directly into P and PA images respectively, which Unpack.c doesn't currently support.This PR fixes that.