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ImageMorph operations must have length 1 #9102

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ImageMorph operations must have length 1 #9102

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https://pillow.readthedocs.io/en/stable/reference/ImageMorph.html

The default is to return the current pixel value, which is returned if no other match is found.

Operations:

  • 4 - 4 way rotation
  • N - Negate
  • 1 - Dummy op for no other operation (an op must always be given)
  • M - Mirroring

When parsing pattern strings, we currently allow operations of any length, even zero.

Pillow/src/PIL/ImageMorph.py

Line 153 in d560320

m = re.search(r"(\w*):?\s*\((.+?)\)\s*->\s*(\d)", p.replace("\n", ""))

This PR requires the operations to have length 1 instead.

@radarhere radarhere force-pushed the imagemorph_operation branch 3 times, most recently from f56b16c to 38207cb Compare July 24, 2025 13:09
@radarhere radarhere force-pushed the imagemorph_operation branch from 38207cb to 14c0af8 Compare July 24, 2025 13:16
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