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For what it may be worth, the last time I saw any difference between using KU to dither the images and Kobo's builtin dithering was before firmware revision 4.13.12638 back in 2019. I'd been using KU to send cover images for years by then but did some testing after noticing I could not see a difference in the images in my ePub tester ebook in that version. It may well have happened earlier, this was just the first time I noticed the lack of difference. This may also say something about how rarely I see full page colour images in a book that I am reading.
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