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Old 03-28-2012, 10:13 AM   #2
kovidgoyal
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That indicates that the image is not recognized as avalid image. This can be either because the img is actually not valid or the image format is not supported. I cant recall if PIL supports the TIFF format you can check that by doing

calibre-debug -c "from PIL import Image; im = Image(); im.open('somefile.tiff')"
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