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Charles, I just sent you the actual jpeg for the cover to your email address.
The thumbnails for this book look just fine in Calibre. In fact I've never once had an issue with how a book cover was rendered in the program.
Calibre does process (resample/resize) original cover images when they exceed a certain size. But that size is configurable with one of the tweaks. In my case the threshold is set so high in the tweak that my covers are never processed by Calibre. At any rate, even when Calibre does resample images, I noticed it doesn't use a high compression, so it produces little artifacts.
--Pat
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