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pnmquant

Quantize the colors in a PNM image into a smaller set. This command is a combination of pnmcolormap and pnmremap and accepts the union of their options, except -mapfile. More information: https://netpbm.sourceforge.net/doc/pnmquant.html.

Generate an image using only n_colors or less colors as close as possible to the input image:

pnmquant {{n_colors}} {{path/to/input.pnm}} > {{path/to/output.pnm}}