pbmnoise

Generate white noise. More information: https://netpbm.sourceforge.net/doc/pbmnoise.html.

• Generate a PGM image containing white noise:

pbmnoise {{width}} {{height}} > {{path/to/output.pbm}}

• Specify the seed for the pseudo-random number generator:

pbmnoise {{width}} {{height}} -randomseed {{value}} > {{path/to/output.pbm}}

• Specify the desired rate of white to black pixels:

pbmnoise {{width}} {{height}} -ratio {{1/3}} > {{path/to/output.pbm}}