create a blank bitmap of a specified size
see also :
[-white|-black|-gray ] width
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portable bitmap of the specified width and height. The color
defaults to 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.
All flags can
be abbreviated to their shortest unique prefix.
1989 by Jef Poskanzer.