tldr/pages/common/pnmhisteq.md

17 lines
494 B
Markdown

# pnmhisteq
> Histogram-equalize a PNM image.
> More information: <https://netpbm.sourceforge.net/doc/pnmhisteq.html>.
- Increase the contrast of a PNM image using histogram equalization:
`pnmhisteq {{path/to/input.pnm}} > {{path/to/output.pnm}}`
- Only modify grey pixels:
`pnmhisteq -grey {{path/to/input.pnm}} > {{path/to/output.pnm}}`
- Do not include black or white pixels in the histogram equalization:
`pnmhisteq -no{{black|white}} {{path/to/input.pnm}} > {{path/to/output.pnm}}`