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Testing out what the exact pagesize is, is pretty hard.
Best thing you can do, is create a 600x800 png, gif or BMP. If the kindle does not support these picture files your last resort is a JPG.
Then create on the picture a B&W GRID.
Say every even line is black, uneven lines are white.
Then save your picture as 600x800 pix.
Crop it, and save another copy as it's native resolution (say 595x795).
All the way down to a little below what you believe is 525x640 resolution (say 520x635 or so)
you might be able to discover the display resolution of the decoder before it upscales the picture.
When the Kindle displays a grey image you most likely are not on it's 'perfect' resolution.
When you can see more areas with Black & White lines than grey area, it means you're getting close!
Come to think of it, even if the 'perfect' resolution was 525x640, it will upscale that picture making it more blurry.
So instead of 1 line black, 1 line white,you'd be better off doing 2 lines black, and 3 white, or reverse,since I suspect 1/1B/W will always seem grey on the kindle.
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