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Print a histogram of the values present in a PGM image. See also: ppmhist. More information:

  • Display the histogram for human reading:

pgmhist {{path/to/image.pgm}}

  • Display the median grey value:

pgmhist -median {{path/to/image.pgm}}

  • Display four quartile grey value:

pgmhist -quartile {{path/to/image.pgm}}

  • Report the existence of invalid grey values:

pgmhist -forensic {{path/to/image.pgm}}

  • Display machine-readable output:

pgmhist -machine {{path/to/image.pgm}}