93 lines
2.5 KiB
HTML
93 lines
2.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of ppmtopgm</TITLE>
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</HEAD><BODY>
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<H1>ppmtopgm</H1>
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Section: User Commands (1)<BR>Updated: 10 April 2000<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="ixAAB"></A>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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ppmtopgm - convert a portable pixmap into a portable graymap
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>ppmtopgm</B>
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[<I>ppmfile</I>]
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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Reads a portable pixmap as input. Produces a portable graymap as
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output. The output is a "black and white" rendering of the original
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image, as in a black and white photograph. The quantization formula
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used is .299 r + .587 g + .114 b.
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<P>
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Note that although there is a
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<B>pgmtoppm</B>
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program, it is not necessary for simple conversions from pgm to ppm ,
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because any ppm program can read pgm (and pbm ) files automatically.
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<B>pgmtoppm</B>
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is for colorizing a pgm file. Also, see
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<B>ppmtorgb3</B>
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<A NAME="ixAAC"></A>
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for a different way of converting color to gray. And
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<B>ppmdist </B>
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generates a grayscale image from a color image, but in a way that makes it
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easy to differentiate the original colors, not necessarily a way that looks
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like a black and white photograph.
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<P>
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<A NAME="lbAE"> </A>
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<H2>QUOTE</H2>
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<PRE>
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Cold-hearted orb that rules the night
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Removes the colors from our sight
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Red is gray, and yellow white
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But we decide which is right
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And which is a quantization error.
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</PRE>
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<A NAME="lbAF"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+pgmtoppm">pgmtoppm</A></B>(1),<B><A HREF="/cgi-bin/man/man2html?1+ppmtorgb3">ppmtorgb3</A></B>(1),<B><A HREF="/cgi-bin/man/man2html?1+rgb3toppm">rgb3toppm</A></B>(1),<B><A HREF="/cgi-bin/man/man2html?1+ppmdist">ppmdist</A></B>(1),<B><A HREF="/cgi-bin/man/man2html?5+ppm">ppm</A></B>(5),<B><A HREF="/cgi-bin/man/man2html?5+pgm">pgm</A></B>(5)
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<A NAME="lbAG"> </A>
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<H2>AUTHOR</H2>
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Copyright (C) 1989 by Jef Poskanzer.
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="4"><A HREF="#lbAE">QUOTE</A><DD>
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<DT id="5"><A HREF="#lbAF">SEE ALSO</A><DD>
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<DT id="6"><A HREF="#lbAG">AUTHOR</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:25 GMT, March 31, 2021
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</BODY>
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</HTML>
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