---
syntax: markdown
tags: [tldr, common]
source: https://github.com/tldr-pages/tldr.git
---
# 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}}`
