Quote:
Originally Posted by wongdong
There is a better way. If you use a freeware picture viewer like irfanview or xnView,
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Well, imagemagick is pretty powerful tool.
Have a look at my post here
https://www.mobileread.com/forums/sho...3&postcount=12
It can do very nice dithering
convert escher01.png -quantize GRAY +dither -colors 16 -rotate "-90>" escher01.bmp
If you want exactly four colors, you can use
convert escher01.png -quantize GRAY +dither -colors 4 -rotate "-90>" escher01.bmp
The above command works with 800x600 or 600x800 pixel bitmap, for explanation go to my post mentioned above. It is better to resize/crop each image manually using good interactive program, like Gimp, so you can see exactly where you are cutting or adding to picture.