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       pnmcut - cut a rectangle out of a portable anymap
       pnmcut x y width height [pnmfile]
       Reads  a  portable  anymap as input.  Extracts the specified rectangle,
       and produces a portable anymap as output.  The x and y can be negative,
       in  which case they are interpreted relative to the right and bottom of
       the anymap, respectively.
       pnm(5)
       Copyright (C) 1989 by Jef Poskanzer.
                               21 February 1989                      pnmcut(1)