Quote:
Originally Posted by samscud
Cover ThumbNail Image"
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Whenever I've seen one of these files in an ebook, it's been a very small image, smaller than the Kindle library cover which is normally 450 px high (for 300 dpi Kindles like Paperwhite at least).
I don't know what used it, never had a problem if I deleted it from the epub before generating an AZW or MOBI.