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I may be completely wrong here but I know that file sizes for epubs are noticeably larger (often double or more) when loaded with iBooks compared to the original file size of the epub. I think I read that that is because when you transfer a book to use with iBooks it decompresses the contents so that when you open a book it is faster. Also, I know that if you download cover art with Calibre it attaches that image file to the epub when you transfer it to iTunes and that image file can be 100kb or more. I was curious if any other reader apps do this or if anyone knows of ways that can keep the file size down in iBooks?
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