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Originally Posted by DNSB
I have to almost agree with you there though I tend to validate on opening before I even start editing. A surprising number of commercial ebooks fail to validate. Once I have modified and validated, the number of issues with reading the ebooks is pretty minimal. I don't bother with trying to losslessly compress the graphics since very few graphics source supply lossless originals.
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Yes, it is interesting how few problems there are when you know the eBooks sent to the Reader are validated.As for losslessly compressing the graphics, it doesn't matter if the ones in the book are lossless originals. What lossless compression does is get rid of any crud in the graphics container without changing them. So you end up with the same graphics at a smaller size.
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One fun item were the sheer number of ebooks where the cover image was repeated. Attributor protected ebooks were a fine example where the first cover image had their logo and the second did not but there were enough others that bulked up the ebook with two cover images. Then there were those ebooks where the scene and/or chapter break was a graphic and every break had it's own copy of the image.
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And there sometimes are eBooks where you get cover thumbnails that have no use at all. I've seen some eBooks where one cover was JPG and the other was PNG. And when you get duplicated section break graphics, they are slightly different. So it's a matter of figuring out which version you want, deleting the rest and fixing the code to use just that one copy.