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Originally Posted by hobnail
I would if there was free software that I could use to convert a color cover into one that is 16 levels of gray and the software understood the colors so that it could increase the contrast where it looks decent in color but not in grayscale.
So many books have nice color covers when I look at them in calibre on my pc and then on my Kobo I can barely make out the details.
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Have you looked at ImageWorsener? Basic setting would be -grayscale and -depthgray 4 (or -depthcc 16). I did a batch file that basically runs the input file through various dithering algorithms and then eyeball them since oddly enough, I find that some images look better with different dithering algorithms.
As to why the name ImageWorsener? To quote the documentation:
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All nontrivial automated image processing causes a loss of information.
While ImageWorsener will degrade your images, its goal is to degrade them as
little as possible.
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