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Improve error messages from C - #9784

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akx wants to merge 4 commits into

python-pillow:mainfrom

akx:wrong-mode-exc

Open

Improve error messages from C#9784
akx wants to merge 4 commits into
python-pillow:mainfrom
akx:wrong-mode-exc

Commits on Oct 10, 2026
- Add PIL._imaging.NotSupportedError
  akx
  committed
  bf035b8
- Allow custom error message for ImagingError_ModeError and ImagingError_Mismatch
  akx
  committed
  855cdc5
- Add bespoke error messages where suitable
  
  akx
  and
  radarhere
  committed
  1a057a9
- Make sure image nullness checks raise ValueErrors, not ModeErrors
  akx
  committed
  f13c6cd