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<!-- CreationDate: Mon Jan 2 17:41:53 2006 -->
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<html>
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<title>RGB2YCBCR</title>
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</head>
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<body>
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<h1 align=center>RGB2YCBCR</h1>
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<a href="#NAME">NAME</a><br>
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<a href="#SYNOPSIS">SYNOPSIS</a><br>
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<a href="#DESCRIPTION">DESCRIPTION</a><br>
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<a href="#OPTIONS">OPTIONS</a><br>
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<a href="#SEE ALSO">SEE ALSO</a><br>
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<hr>
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<a name="NAME"></a>
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<h2>NAME</h2>
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<p style="margin-left:11%; margin-top: 1em">rgb2ycbcr
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− convert non-YCbCr <small>TIFF</small> images to a
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YCbCr <small>TIFF</small> image</p>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>rgb2ycbcr</b>
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[ <i>options</i> ] <i>src1.tif src2.tif ... dst.tif</i></p>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p style="margin-left:11%; margin-top: 1em"><i>rgb2ycbcr</i>
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converts <small>RGB</small> color, greyscale, or bi-level
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<small>TIFF</small> images to YCbCr images by transforming
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and sampling pixel data. If multiple files are specified on
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the command line each source file is converted to a separate
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directory in the destination file.</p>
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<p style="margin-left:11%; margin-top: 1em">By default,
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chrominance samples are created by sampling 2 by 2 blocks of
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luminance values; this can be changed with the
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<b>−h</b> and <b>−v</b> options. Output data are
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compressed with the <small>PackBits</small> compression
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scheme, by default; an alternate scheme can be selected with
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the <b>−c</b> option. By default, output data are
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compressed in strips with the number of rows in each strip
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selected so that the size of a strip is never more than 8
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kilobytes; the <b>−r</b> option can be used to
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explicitly set the number of rows per strip.</p>
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<a name="OPTIONS"></a>
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<h2>OPTIONS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>−c</b></p> </td>
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<td width="8%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Specify a
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compression scheme to use when writing image data:
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<b>−c none</b> for no compression, <b>-c packbits</b>
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for the PackBits compression algorithm (the default), <b>-c
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jpeg</b> for the JPEG compression algorithm, <b>-c zip</b>
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for the deflate compression algorithm, and <b>−c
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lzw</b> for Lempel-Ziv & Welch.</p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>−h</b></p> </td>
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<td width="8%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Set the horizontal
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sampling dimension to one of: 1, 2 (default), or 4.</p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>−r</b></p> </td>
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<td width="8%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Write data with a
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specified number of rows per strip; by default the number of
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rows/strip is selected so that each strip is approximately 8
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kilobytes.</p> </td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>−v</b></p> </td>
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<td width="8%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Set the vertical
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sampling dimension to one of: 1, 2 (default), or 4.</p></td>
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</table>
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>tiffinfo</b>(1),
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<b>tiffcp</b>(1), <b>libtiff</b>(3)</p>
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<p style="margin-left:11%; margin-top: 1em">Libtiff library
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home page: <b>http://www.remotesensing.org/libtiff</b></p>
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<hr>
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</body>
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</html>
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