pbmmake - create a blank bitmap of a specified size
pbmmake [-white|-black|-gray] width height
You can abbreviate any option to its shortest unique prefix.
This program is part of Netpbm(1).
pbmmake produces a PBM image of the specified width and height, either all black, all white, or a dithered gray. The default is white.
In addition to the usual -white and -black, this program implements -gray. This gives a simple 50% gray pattern with 1's and 0's alternating.