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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Ppmtoyuvsplit User Manual</title></head>
<body>
<h1>ppmtoyuvsplit</h1>
Updated: 06 March 2003
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
ppmtoyuvsplit - convert a PPM image to 3 subsampled raw YUV files
<h2 id="synopsis">SYNOPSIS</h2>
<b>ppmtoyuvsplit</b>
<i>basename</i>
[<i>ppmfile</i>]
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>ppmtoyuvsplit</b> reads a PPM image as input. Produces 3 raw
files <i>basename</i>.Y, <i>basename</i>.U and <i>basename</i>.V as
output.
<p>The output files are the subsampled raw YUV representation of the
input PPM image, as required by the Stanford MPEG codec. The Y output
file contains a byte for each pixel in the image, with the rows going
from top to bottom and the columns within each row going left to
right. The U and V output files are arranged similarly, except that
each byte represents a square of 4 pixels of the image. The value is
the arithmetic mean of the value for each of those 4 pixels. Hence, the
Y file is 4 times the size of the U file or V file.
<p>The YUV values are scaled according to CCIR.601, as assumed by
MPEG.
<h2 id="options">OPTIONS</h2>
<p>There are no command line options defined specifically
for <b>ppmtoyuvsplit</b>, but it recognizes the options common to all
programs based on libnetpbm (See <a href="index.html#commonoptions">
Common Options</a>.)
<h2 id="seealso">SEE ALSO</h2>
<a href="yuvsplittoppm.html">yuvsplittoppm</a>,
<a href="ppmtoyuv.html">ppmtoyuv</a>,
<a href="ppmtoeyuv.html">ppmtoeyuv</a>,
<a href="ppmtompeg.html">ppmtompeg</a>,
<a href="ppm.html">ppm</a>
<h2 id="author">AUTHOR</h2>
<p>Copyright (C) 1993 by Andre Beck. (<a
href="mailto:Andre_Beck@IRS.Inf.TU-Dresden.de">Andre_Beck@IRS.Inf.TU-Dresden.de</a>)
<p>Based on ppmtoyuv.c
<hr>
<h2 id="index">Table Of Contents</h2>
<ul>
<li><a href="#synopsis">SYNOPSIS</a>
<li><a href="#description">DESCRIPTION</a>
<li><a href="#options">OPTIONS</a>
<li><a href="#seealso">SEE ALSO</a>
<li><a href="#author">AUTHOR</a>
</ul>
</body>
</html>
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