Thread: Bloated epub file sizes?
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Old 07-18-2014, 01:04 PM   #19
j.p.s
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Quote:
Originally Posted by Joques View Post
Huh. I just tried reconverting one of the worse offenders, The Heroes by Abercrombie at 3,6 MB. Ticking "subset all embedded fonts" yielded no difference in file size. But I checked the contents, and those map file are a whopping 300kB per file. For low-res B/W image files. No compression at all, it seems. That is crazy!
If those maps are line drawings and are JPEGs, they should have been created as PNG. PNG line drawings generally take less space and look nicer than JPEGs of line drawings. It might be possible to clean up the JPEGs and convert to PNG, but JPEG artifacts would probably remain, adding ugliness increasing file size.

If they really are an uncompressed type (does EPUB even support uncompressed images?), compressing will help a lot. Again, for line drawings, PNG will usually be much better than JPEG.
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