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pnmarith
!!!pnmarith
NAME
SYNOPSIS
DESCRIPTION
SEE ALSO
AUTHOR
----
!!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 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
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Last edited on Monday, June 3, 2002 6:50:56 pm by "perry"

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