Quote:
Originally Posted by ownedbycats
Also, re: lossless compression - in general, running it can paradoxically increase the filesize. If the image is already compressed (ever tried putting a zip file inside another zip file?), or if it's sufficiently complex that the compressor can't efficiently smoosh it down. I think Polish ePub might account for this by not replacing if there's no net reduction, but I'm not 100% on that.
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Lossless compression will not replace an existing image if the image is any larger or cannot be compressed.