152 lines
4.0 KiB
HTML
152 lines
4.0 KiB
HTML
<!-- Creator : groff version 1.18.1 -->
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<!-- CreationDate: Sun Mar 6 13:59:57 2005 -->
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<html>
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<head>
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta name="Content-Style" content="text/css">
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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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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="8%"></td>
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<td width="91%">
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<p>rgb2ycbcr − convert non-YCbCr <small>TIFF</small>
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images to a YCbCr <small>TIFF</small> image</p>
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</td>
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</table>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="8%"></td>
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<td width="91%">
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<p><b>rgb2ycbcr</b> [ <i>options</i> ] <i>src1.tif src2.tif
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... dst.tif</i></p>
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</td>
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</table>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="8%"></td>
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<td width="91%">
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<p><i>rgb2ycbcr</i> converts <small>RGB</small> color,
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greyscale, or bi-level <small>TIFF</small> images to YCbCr
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images by transforming and sampling pixel data. If multiple
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files are specified on the command line each source file is
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converted to a separate directory in the destination
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file.</p>
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<p>By default, chrominance samples are created by sampling 2
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by 2 blocks of luminance values; this can be changed with
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the <b>−h</b> and <b>−v</b> options. Output data
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are 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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</td>
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</table>
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<a name="OPTIONS"></a>
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<h2>OPTIONS</h2>
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<!-- TABS -->
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<table width="100%" border=0 rules="none" frame="void"
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cols="5" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td>
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<td width="3%">
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<p><b>−c</b></p>
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</td>
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<td width="5%"></td>
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<td width="80%">
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<p>Specify a compression scheme to use when writing image
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data: <b>−c none</b> for no compression, <b>-c
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packbits</b> for the PackBits compression algorithm (the
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default), <b>-c jpeg</b> for the JPEG compression algorithm,
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<b>-c zip</b> for the deflate compression algorithm, and
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<b>−c lzw</b> for Lempel-Ziv & Welch.</p>
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</td>
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<td width="0%">
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</td>
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<tr valign="top" align="left">
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<td width="10%"></td>
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<td width="3%">
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<p><b>−h</b></p>
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</td>
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<td width="5%"></td>
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<td width="80%">
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<p>Set the horizontal sampling dimension to one of: 1, 2
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(default), or 4.</p>
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</td>
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<td width="0%">
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</td>
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<tr valign="top" align="left">
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<td width="10%"></td>
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<td width="3%">
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<p><b>−r</b></p>
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</td>
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<td width="5%"></td>
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<td width="80%">
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<p>Write data with a specified number of rows per strip; by
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default the number of rows/strip is selected so that each
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strip is approximately 8 kilobytes.</p>
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</td>
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<td width="0%">
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</td>
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<tr valign="top" align="left">
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<td width="10%"></td>
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<td width="3%">
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<p><b>−v</b></p>
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</td>
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<td width="5%"></td>
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<td width="80%">
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<p>Set the vertical sampling dimension to one of: 1, 2
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(default), or 4.</p>
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</td>
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<td width="0%">
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</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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<!-- INDENTATION -->
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="8%"></td>
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<td width="91%">
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<p><i>tiffinfo</i>(1), <i>tiffcp</i>(1),
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<i>libtiff</i>(3)</p>
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</td>
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</table>
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<hr>
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</body>
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</html>
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