This is the command pnmarith that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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.
Use pnmarith online using onworks.net services
