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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML><HEAD><TITLE>Pnminvert User Manual</TITLE></HEAD> <BODY> <H1>pnminvert</H1> Updated: 08 August 1989 <BR> <A HREF="#index">Table Of Contents</A> <A NAME="lbAB"> </A> <H2>NAME</H2> pnminvert - invert a PNM image <A NAME="lbAC"> </A> <H2>SYNOPSIS</H2> <B>pnminvert</B> [<I>pnmfile</I>] <A NAME="lbAD"> </A> <H2>DESCRIPTION</H2> <p>This program is part of <a href="index.html">Netpbm</a>. <p><b>pnminvert</b> reads a PNM image as input, inverts it black for white, and produces a PNM image as output. <p>If the image is grayscale, <b>pnminvert</b> 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. <p>If the image is color, <b>pnminvert</b> inverts each individual RGB component the same as for a grayscale image. <A NAME="lbAE"> </A> <H2>SEE ALSO</H2> <A HREF="pnm.html">pnm</A> <A NAME="lbAF"> </A> <H2>AUTHOR</H2> Copyright (C) 1989 by Jef Poskanzer. <HR> <A NAME="index"> </A> <H2>Table Of Contents</H2> <UL> <LI><A HREF="#lbAB">NAME</A> <LI><A HREF="#lbAC">SYNOPSIS</A> <LI><A HREF="#lbAD">DESCRIPTION</A> <LI><A HREF="#lbAE">SEE ALSO</A> <LI><A HREF="#lbAF">AUTHOR</A> </UL> </BODY> </HTML>