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1994-03-01
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pnmarith(1) AMIGA (26 August 1993) 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.
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>
Page 1 (printed 3/1/94)