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    The following form allows you to view linux man pages.

    Command:

    pnmarith

    
    
    

    SYNOPSIS

           pnmarith  -add|-subtract|-multiply|-difference|-minimum|-maximum.  pnm-
           file1 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 pnmfile2, 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 <wijkstra@fwi.uva.nl>
    
                                    26 August 1993                     pnmarith(1)
    
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