tldr/pages/common/pnmhistmap.md

# 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 {{[-d|-dots]}} {{path/to/input.pnm}} > {{path/to/output.pnm}}`

- Specify the range of intensity values to include:

`pnmhistmap {{[-l|-lval]}} {{minval}} {{[-rv|-rval]}} {{maxval}} {{path/to/input.pnm}} > {{path/to/output.pnm}}`