You can abbreviate any option to its shortest unique prefix.
This program is part of Netpbm.
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 options common to all programs based on libnetpbm (most notably -quiet, see Common Options), pbmmake recognizes the following command line options:
These options specify the color of the output. -white means all pixels are white. -black means all pixels are black. -gray means black and white pixels alternate.
You may specify only one of these. The default is all white.