Pillow

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Pillow 12.3.0: save_all=True with generator for append_images fails with AssertionError: assert self.fp is not None

Pillow 12.3.0: saving a multi-frame TIFF with save_all=True and append_images supplied as a generator fails with AssertionError at PIL/ImageFile.py load: assert self.fp is not None. Each generator iteration opens an existing PNG inside a with Image.open(path) block and yields that image, so it…

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