Thread: Calibre dont like 256 colors png cover
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Old 07-10-2018, 12:18 PM   #2
kovidgoyal
creator of calibre
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calibre stores covers in JPG format. JPG does not support indexed images. If you want to preserve the cover in your EPUB files you can either:

1) Turn off theEPUB metadata writer plugin in calibre, then EPUB metadata including covers will not be changed

2) Do not set a cover for the boo in calibre, then the in-book cover will be preserved
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