Quote:
Originally Posted by JSWolf
It's both lossy and lossless. Lossy for the recompression with 70% and lossless after that to make the image an even smaller size.
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Quote:
Originally Posted by John F
Thank you for the clarification. I'm going to start doing the additional lossless compression.
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I tried it on a couple of ebooks, and I'm seeing some interesting behaviour using the calibre editor.
I do a lossy compression and then a lossless compression in the same editing session, and the lossless compression says it couldn't compress any further. and I exit.
After that, every time I do another lossless compression, it reports it is able to compress the cover image for the same amount (this is doing a compression and then exiting (and saving)).