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       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)