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:
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.
With none of the above specified, the output image will be entirely white.