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ppmdist
Produce a grayscale version of a PPM image. More information: https://netpbm.sourceforge.net/doc/ppmdist.html.
- Produce a grayscale version of the specified PPM image:
ppmdist {{path/to/input.ppm}} > {{path/to/output.pgm}}
- Specify the method used to map colors to graylevels:
ppmdist -{{frequency|intensity}} {{path/to/input.ppm}} > {{path/to/output.pgm}}