pgmnoise - create a graymap made up of white noise
pgmnoise width height
Creates a portable graymap that is made up of random pixels with gray
values in the range of 0 to PGM_MAXMAXVAL (depends on the compilation,
either 255 or 65535). The graymap has a size of width * height pixels.
pgm(5)
Copyright (C) 1993 by Frank Neumann
16 November 1993 pgmnoise(1)