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pgmtoppm

Colorize a PGM image. More information: https://netpbm.sourceforge.net/doc/pgmtoppm.html.

Map all greyscale values of the input image to all colors between the two specified colors:

pgmtoppm -black {{red}} --white {{blue}} {{path/to/input.pgm}} > {{path/to/output.ppm}}

Map all greyscale values of the input image to colors according to the specified colormap:

pgmtoppm -map {{path/to/colormap.ppm}} {{path/to/input.pgm}} > {{path/to/output.ppm}}