pnmarith
Section: User Commands (1)
Updated: 26 August 1993
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NAME
pnmarith  perform arithmetic on two portable anymaps
SYNOPSIS
pnmarith
addsubtractmultiplydifferenceminimummaximum.
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>
Index
 NAME

 SYNOPSIS

 DESCRIPTION

 SEE ALSO

 AUTHOR

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