Quote:
Originally Posted by comtrjl
Four shades is true of the Cybook, but not of the PRS-505, which does 8, or of the Iliad, which does sixteen.
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In which case, in order to get the best presentation of your image on those screens, you should reduce the number of levels to either 8 or 16.
This is an example of both posterization and dithering at 8 levels:
and the same thing at 16 levels:
You might even be able to get away with posterization at 16 levels of gray, but I would submit that the dithered photo looks better.