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Old 08-18-2016, 11:07 PM   #2
kovidgoyal
creator of calibre
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I have no idea what you are talking about. What's a preview? You mean extracting a cover? If so covers are extracted only from known ebook formats. JPEG/GIF/pNG are not a known ebook format. If you bundle up you image files into a CBZ, then calibre will be able to extract a cover from it.
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