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RedHat 9 (Linux i386) - man page for pnmarith (redhat section 1)

pnmarith(1)			     General Commands Manual			      pnmarith(1)

NAME
       pnmarith - perform arithmetic on two portable anymaps

SYNOPSIS
       pnmarith -add|-subtract|-multiply|-difference|-minimum|-maximum.  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.

       The operator -difference calculates the absolute value of pnmarith -subtract pnmfile1 pnm-
       file2, i.e. no truncation is done.

       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.  Lightly modified  by  Marcel  Wijkstra  <wijk-
       stra@fwi.uva.nl>

					  26 August 1993			      pnmarith(1)


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