tldr/pages/common/pgmhist.md

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# pgmhist
> Print a histogram of the values present in a PGM image.
> See also: `ppmhist`.
> More information: <https://netpbm.sourceforge.net/doc/pgmhist.html>.
- 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}}`