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Why can't e-readers have a standard size of screen, or at least a standard ratio of screen size (like with TVs)? As an example, my Nook Color has a screen size of 3.5 inches by 5.75 inches, yet my Nook Glowlight 4 has a screen size of 3.5 inches by 4.75 inches. One option would be to adopt Metric Paper sizes, such as A5 and A6.
The advantage of this is that each screen maintains the same proportion of height to width as the previous size, so with photos there is no blank space and no cropping necessary. An an example, A5 paper is approximately 5.8 inches by 8.3 inches (a nice size for a large e-reader), while A6 paper is 5.8 inches by 4.1 inches (a nice size for a smaller e-reader).
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