If Pillow or numpy aren't importable, fail fast with a clear **ERROR** message and pip-install hint instead of a bare traceback from inside pixel_diff(). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
If Pillow or numpy aren't importable, fail fast with a clear **ERROR** message and pip-install hint instead of a bare traceback from inside pixel_diff(). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>