Basic HTML never actually defines the size of a display pixel. It's entirely up to the display software. Most assumes that a pixel is between 1/72" and 1/96".
With CSS it is possible to specify sizes in real units, but even there the accuracy is dependant on the rendering software.
So IMO it's best to look at the number of pixels in the screens of the devices where ebooks are usually displayed.
For full page images, that's currently around 600-800 pixels
Last edited by pdurrant; 11-05-2012 at 08:44 AM.
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