tldr/pages/common/pnmindex.md

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# pnmindex
> Build a visual index of multiple PNM images.
> See also: `pamundice`.
> More information: <https://netpbm.sourceforge.net/doc/pnmindex.html>.
- Produce an image containing thumbnails of the specified images in a grid:
`pnmindex {{path/to/input1.pnm path/to/input2.pnm ...}} > {{path/to/output.pnm}}`
- Specify the size of the (quadratic) thumbnails:
`pnmindex -size {{50}} {{path/to/input1.pnm path/to/input2.pnm ...}} > {{path/to/output.pnm}}`
- Specify the number of thumbnails per row:
`pnmindex -across {{10}} {{path/to/input1.pnm path/to/input2.pnm ...}} > {{path/to/output.pnm}}`
- Specify the maximum number of colors in the output:
`pnmindex -colors {{512}} {{path/to/input1.pnm path/to/input2.pnm ...}} > {{path/to/output.pnm}}`