I recentally added almost half a section just on bi-level color quantization, just a little over a week ago.
This includes threshold, monochrome dithering and quite a number of other dithering options.. IM Examples, Color Quantization and Dithering
Bitmap generating and Dithering (true bi-color images)
http://www.cit.gu.edu.au/~anthony/graph ... her_bitmap
Enjoy...
PS: I am currently working to add a multi-level ordered dither function to IM basied on results from this new IM Examples section.
TIFF to bilevel, best command?
- anthony
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Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
https://imagemagick.org/Usage/