<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML><HEAD><TITLE>Ppmtorgb3 User Manual</TITLE></HEAD> <BODY> <H1>ppmtorgb3</H1> Updated: 10 January 1991 <BR> <A HREF="#index">Table Of Contents</A> <A NAME="lbAB"> </A> <H2>NAME</H2> ppmtorgb3 - separate a PPM image into three PGMs <A NAME="lbAC"> </A> <H2>SYNOPSIS</H2> <B>ppmtorgb3</B> [<I>ppmfile</I>] <A NAME="lbAD"> </A> <H2>DESCRIPTION</H2> <p>This program is part of <a href="index.html">Netpbm</a>. <p><b>ppmtorgb3</b> reads a PPM image as input and writes three PGM images as output, one each for red, green, and blue. <p><b>ppmtorgb3</b> constructs the output filenames by taking the input filename, stripping off any extension, and appending <b>.red</b>, <b>.grn</b>, <b>.blu</b>. For example, separating <b>lenna.ppm</b> would result in <b>lenna.red</b>, <b>lenna.grn</b>, and <b>lenna.blu</b>. If the input comes from stdin, the names are <b>noname.red</b>, <b>noname.grn</b>, and <b>noname.blu</b>. <A NAME="lbAE"> </A> <H2>SEE ALSO</H2> <A HREF="rgb3toppm.html">rgb3toppm</A>, <A HREF="pamchannel.html">pamchannel</A>, <A HREF="ppmtopgm.html">ppmtopgm</A>, <A HREF="pgmtoppm.html">pgmtoppm</A>, <A HREF="ppm.html">ppm</A>, <A HREF="pgm.html">pgm</A> <A NAME="lbAF"> </A> <H2>AUTHOR</H2> Copyright (C) 1991 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>