[DaleDe]

Originally Posted by RickyMaveety

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:

http://www.geocities.com/ricky1750/Graphics/A62E8p.jpg

http://www.geocities.com/ricky1750/Graphics/A62E8gs.jpg

and the same thing at 16 levels:

http://www.geocities.com/ricky1750/Graphics/A62E16p.jpg

http://www.geocities.com/ricky1750/G...s/A62E16gs.jpg

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.

In my experience you don't want to dither too early if a all. Dithering fills the image with little white or black dots to try and achieve additional gray levels. Once done it is not reversible. Usually I try to avoid dithering but if I need it I reduce the colors to 256 and then grayscale prior to attempting any dithering. I will also try and balance the image so that everything is not at one end of the darkness spectrum. It is a bit of art but the resutls can be pretty good. I usually don't drop below 16 levels and let the device itself do the final reduction if needed. After all you might buy a better device in the future.

Dale