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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML><HEAD><TITLE>Ppmtopgm User Manual</TITLE> </HEAD><BODY> <H1>ppmtopgm</H1> Updated: 10 April 2000 <BR> <A HREF="#index">Table Of Contents</A> <A NAME="lbAB"> </A> <H2>NAME</H2> ppmtopgm - convert a PPM image to a PGM image <A NAME="lbAC"> </A> <H2>SYNOPSIS</H2> <B>ppmtopgm</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>ppmtopgm</b> reads a PPM as input and produces a PGM as output. The output is a "black and white" rendering of the original image, as in a black and white photograph. The quantization formula <b>ppmtopgm</b> uses is g = .299 r + .587 g + .114 b. <P>Note that although there is a <B>pgmtoppm</B> program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can read pgm (and pbm ) files automatically. <B>pgmtoppm</B> is for colorizing a pgm file. Also, see <B>ppmtorgb3</B> for a different way of converting color to gray. And <B>ppmdist</B> generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original colors, not necessarily a way that looks like a black and white photograph. <A NAME="lbAE"> </A> <H2>QUOTE</H2> <PRE> Cold-hearted orb that rules the night Removes the colors from our sight Red is gray, and yellow white But we decide which is right And which is a quantization error. </PRE> <A NAME="lbAF"> </A> <H2>SEE ALSO</H2> <B><A HREF="pgmtoppm.html">pgmtoppm</A></B>, <B><A HREF="ppmtorgb3.html">ppmtorgb3</A></B>, <B><A HREF="rgb3toppm.html">rgb3toppm</A></B>, <B><A HREF="ppmdist.html">ppmdist</A></B>, <B><A HREF="ppm.html">ppm</A></B>, <B><A HREF="pgm.html">pgm</A></B> <A NAME="lbAG"> </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">QUOTE</A> <LI><A HREF="#lbAF">SEE ALSO</A> <LI><A HREF="#lbAG">AUTHOR</A> </UL> </BODY> </HTML>