I thought it had long been established that the resolution for cover images was 600x800x167dpi and all other images were 520x622x167 dpi. These are the resolutions I've always used and they seem to work perfectly for me. Of course, to the best of my knowledge, you can't fill the entire screen area with an in-book image the way you can with a cover but the above resolution was said to be the actual resolution of the viewable/usable area of the screen. From what I've seen, that appears to be correct.
I am curious to check out your test file though and see what you have. It may be that I've been operating under incorrect assumptions all this time.
- Byron
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