pnmarith - Online in the Cloud

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.

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