Man page 1 : pbmmake

pbmmake - create a blank bitmap of a specified size

pbmmake [ -white | -black | -gray ] width height

Produces a portable bitmap of the specified width and height. The color defaults to white.

In addition to the usual

-white and

R -black , this program implements

R -gray . This gives a simple 50% gray pattern with 1's and 0's alternating.

All flags can be abbreviated to their shortest unique prefix.

pbm(5), ppmmake(1)

Copyright (C) 1989 by Jef Poskanzer.