tldr/pages/common/pnmhistmap.md

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# pnmhistmap
> Draw a histogram of a PNM image.
> More information: <https://netpbm.sourceforge.net/doc/pnmhistmap.html>.
- Draw a histogram of a PNM image:
`pnmhistmap {{path/to/input.pnm}} > {{path/to/output.pnm}}`
- Draw the histogram as dots instead of bars:
`pnmhistmap -dots {{path/to/input.pnm}} > {{path/to/output.pnm}}`
- Specify the range of intensity values to include:
`pnmhistmap -lval {{minval}} -rval {{maxval}} {{path/to/input.pnm}} > {{path/to/output.pnm}}`