Personally, I tend to use width percentages and height percentages relative to an 600x800 minimum screen resolution so the images appear close to the same size on any of my devices. The samples I've seen in this thread using a max-width expressed in pixels(*). would have my KA1 showing a image less than 50% of the width of the screen while on my old Touch, it would be close to the width and height of the screen (~532x800 for the 626x942 number quoted) if the aspect ratio was maintained.
(*) Pixels like other absolute measurement unit should be banned in ebooks.
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