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