tldr/pages/common/pbmmask.md

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# pbmmask
> Create a mask bitmap from a regular bitmap.
> See also: `pambackground`.
> More information: <https://netpbm.sourceforge.net/doc/pbmmask.html>.
- Create a mask bitmap separating background from foreground:
`pbmmask {{path/to/image.pbm}} > {{path/to/output.pbm}}`
- Expand the generated mask by one pixel:
`pbmmask -expand {{path/to/image.pbm}} > {{path/to/output.pbm}}`