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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD><title>Pnmarith User Manual</title></HEAD> <BODY> <H1>pnmarith</H1> Updated: 22 June 2002 <BR> <H2>NAME</H2> pnmarith - perform arithmetic on two PNM images <H2>DESCRIPTION</H2> <p>This program is part of <a href="index.html">Netpbm</a>. <P>Starting with Netpbm 10.3, <b>pnmarith</b> is obsolete. Use <a href="pamarith.html"><b>pamarith</b></a> instead. <b>pamarith</b> is backward compatible with <b>pnmarith</b> except where your input images have different depths. <b>pnmarith</b> would convert the one with the lesser depth to have the higher depth before doing the arithmetic. With <b>pamarith</b>, you must do that step separately, using <b>pgmtoppm</b>. </BODY> </HTML>