tldr/pages/common/pnmindex.md

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}}