pnmarith(1)             UNIX System V(13 January 1991)              pnmarith(1)


NAME
      pnmarith - perform arithmetic on two portable anymaps

SYNOPSIS
      pnmarith -add|-subtract|-multiply pnmfile1 pnmfile2

DESCRIPTION
      Reads two portable anymaps as input.  Performs the specified arithmetic
      operation, and produces a portable anymap as output.  The two input
      anymaps must be the same width and height.

      The arithmetic is performed between corresponding pixels in the two
      anymaps, as if maxval was 1.0, black was 0.0, and a linear scale in
      between.  Results that fall outside of [0..1) are truncated.

      All flags can be abbreviated to their shortest unique prefix.

SEE ALSO
      pbmmask(1), pnmpaste(1), pnminvert(1), pnm(5)

AUTHOR
      Copyright (C) 1989, 1991 by Jef Poskanzer.
































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