I discovered that if you put into the epub an image with the filename ending with "cover.jpg" it is used as thumbnail even if it's not declared into the opf.
This does not explain the random right/wrong image anyway because in those ebooks I checked the cover are always called in the form Author_ISBN-number_etc.jpg
EDIT: No... my mistake. It has to be declared and what matters is the position of its declaration (see below).
Last edited by Bonex; 02-28-2011 at 12:06 PM.
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