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Originally Posted by chaley
OK, I see what is happening. As I mentioned, calibre uses a .7 compression quality index when creating the thumbnails. For this cover, it produces a size of 7,000 bytes. If I change the quality to .9 then the size goes up to 12,000 and the compression artifacts are largely gone. See the attached cover.
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Oh, that looks great! Thanks for taking the time to troubleshoot.
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I will add a tweak (or something) to calibre to let you set the compression quality. The question is should this be by-device or calibre wide?
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I don't know enough about how Calibre operates to give an informed opinion. I guess either way is good for me, so long as severe compression artifacts can be avoided on the device.
What I don't understand is that you seem to be saying that Calibre makes a thumbnail of a particular cover just once -- and then uses that single thumbnail both for its own internal use (cover browser etc.) and for sending to devices when exporting books. If that's the case, how come this particular cover (Mudbound) looks perfect in my Calibre interface (I can detect no compression artifacts at all) but it looks so splotchy in the book details page of CC? It's like night and day?
--Pat