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Originally Posted by unrequited
824x1200 is what's supposed to be the resolution and what MangleDX outputs.
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This is the resolution of the entire screen, which may be correct for the image viewer but for e-books (in particular MOBI ebooks) the maximum resolution for images is smaller because they don't fill the entire screen. From
Kindle DX Image Test:
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The DX screen is 824 pixels wide by 1200 pixels high, and the viewable book area on the DX is 744px wide by 1022px high.
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This is close enough to 741x1022, that I'm sure both are based on trying to measure the exact dimensions and one or the other is a bit off.
Joshua Tallent also says:
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The actual size of the viewable book area on the Kindle 1 screen is 524px × 640px, and the viewable book area on the Kindle 2 screen is 520px × 622px.
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Based on inspection of screenshots, I think the K1's maximum image resolution is 525x640 (1 pixel more than Joshua's width).
A difference of 1-3 pixels might cause a Kindle to rescale the image, although the result may be indistinguishable from the original. Note that Kindles preserve an image's aspect ratio, so the width won't matter (for rescaling) if the image is tall enough.