|Linux & Unix Commands - Search Man Pages
pnmarith - perform arithmetic on two portable anymaps
pnmarith -add|-subtract|-multiply|-difference|-minimum|-maximum. pnmfile1 pnmfile2
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
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.
pbmmask(1), pnmpaste(1), pnminvert(1), pnm(5)
Copyright (C) 1989, 1991 by Jef Poskanzer. Lightly modified by Marcel Wijkstra <wijk-
26 August 1993 pnmarith(1)
All times are GMT -4. The time now is 12:10 AM.