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ppmdither

Reduce the number of colors in an image by applying dithering. More information: https://netpbm.sourceforge.net/doc/ppmdither.html.

Read a PPM image, apply dithering and save it to a file:

ppmdither {{path/to/image.ppm}} > {{path/to/file.ppm}}

Specify the desired number of shades for each primary color:

ppmdither -red {{2}} -green {{3}} -blue {{2}} {{path/to/image.ppm}} > {{path/to/file.ppm}}

Specify the dimensions of the dithering matrix:

ppmdither -dim {{2}} {{path/to/image.ppm}} > {{path/to/file.ppm}}