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Originally Posted by perdman
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Makes me hate the MOBI format all the more. I just wish Kindle would get with the program and work with EPUB a bit more nicely! Bloating a 10MB file all the way up to 40MB is really killing this.
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One, no matter how hard you work you can't change the past. MOBI is what MOBI was well over a decade ago, long before CSS existed. MOBI is, by today's measure, an antique format.
Two, Amazon has advanced. While they don't support ePub directly, their advanced formats, AZW3 and its brethren, do match ePub's feature and functionality almost 1:1 while still supporting Amazon's DRM methods that are substantially easier for beginners to deal with than the Adobe system that dominates the ePub world.
Back to the real topic: Careful review and possibly editing in a good bitmap editor can sometimes yield JPEGs substantially smaller that the ones Id created. If those embedded PDFs-come-JPEG images came from PDFs that themselves contained scanned pages then cleaning the images so that the white backgrounds are clean with no noise will result in much smaller JPEGs.