Man1 - pnminvert.1
Table of Contents
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NAME
pnminvert - invert a PNM image
SYNOPSIS
pnminvert
[/pnmfile/]
DESCRIPTION
This program is part of *Netpbm*(1)
pnminvert reads a PNM image as input, inverts it black for white, and produces a PNM image as output.
If the image is grayscale, pnminvert replaces a pixel with one of complementary brightness, i.e. if the original pixel has gamma-adjusted gray value G, the output pixel has gray value maxval - G.
If the image is color, pnminvert inverts each individual RGB component the same as for a grayscale image.
SEE ALSO
*pnm*(5)
AUTHOR
Copyright (C) 1989 by Jef Poskanzer.