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Amazon creates several Kindle e-book formats when a book is published. They also produce multiple variants of each format with different image quality targeted to different app and device types. Image resolution can be reduced and color may be eliminated.
The maximum resolution I have ever seen is around 3500 pixels for comics delivered to the iOS and Android apps. Images delivered to e-ink Kindles max out around 2000 pixels. Perhaps that will change with the new Kindle Scribe.
Customers who use the Download & transfer via USB option can get significantly lower resolution images compared with direct over-the-air delivery of the same book.
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