.TL
Pnminvert User Manual
.SH 1
pnminvert
.LP
Updated: 08 August 1989
.br
Table Of Contents
.SH 2
NAME
.LP
pnminvert - invert a PNM image
.SH 2
SYNOPSIS
.LP
\fBpnminvert\fR
[\fIpnmfile\fR]
.SH 2
DESCRIPTION
.LP
.LP
This program is part of Netpbm.
.LP
\fBpnminvert\fR reads a PNM image as input, inverts it black for
white, and produces a PNM image as output.
.LP
If the image is grayscale, \fBpnminvert\fR 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.
.LP
If the image is color, \fBpnminvert\fR inverts each individual RGB
component the same as for a grayscale image.
.SH 2
SEE ALSO
.LP
pnm
.SH 2
AUTHOR
.LP
Copyright (C) 1989 by Jef Poskanzer.
.br
\l'5i'
.SH 2
Table Of Contents
.LP
.IP \(bu
NAME
.IP \(bu
SYNOPSIS
.IP \(bu
DESCRIPTION
.IP \(bu
SEE ALSO
.IP \(bu
AUTHOR
.LP