You want a pointer... Can you handle a pointer...
Here is a pointer...
IM examples, Quantization and Dithering, thresholding
http://www.imagemagick.org/Usage/quantize/#threshold
Sorry, I am in a flippent mood.
Gimp style threshold and 1-bit indexing
- anthony
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Re: Gimp style threshold and 1-bit indexing
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
https://imagemagick.org/Usage/