Quote:
Originally Posted by UberMike
Most of these were got with the download cover feature, usually from Amazon.
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That's because the cover download feature in calibre doesn't actually change the epub. You have to do an epub-to-epub conversion for that, if you want to do it within calibre, or else open the epub in an archive program (7-Zip is free and good - just right-click on the epub and choose 7-Zip->Open archive) and replace the existing cover.jpg with the new cover.jpg (which will be sitting in the book's directory in your calibre library; might have to delete the existing cover.jpg first instead of just dragging-and-dropping the new one into the archive - can't remember if 7-Zip replaces files by default).