ppmtopgm

Convert a PPM image to a PGM image. More information: https://netpbm.sourceforge.net/doc/ppmtopgm.html.

• Convert PPM image to PGM image:

ppmtopgm {{path/to/file.ppm}} > {{path/to/file.pgm}}

• Display version:

ppmtopgm -version