ppmtorgb3

Separate the color components of a PPM file into three separate PGM files. See also: rgb3toppm. More information: https://netpbm.sourceforge.net/doc/ppmtorgb3.html.

• Separate the color components of a PPM file, saving the outputs to file.red, file.grn and file.blu:

ppmtorgb3 {{path/to/file.ppm}}