134 lines
4.7 KiB
HTML
134 lines
4.7 KiB
HTML
<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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<!-- Creator : groff version 1.17.2 -->
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<!-- CreationDate: Thu Nov 27 17:58:10 2003 -->
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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="10%"></td><td width="90%">
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rgb2ycbcr - convert non-YCbCr <small>TIFF</small> images to a YCbCr <small>TIFF</small> image</td></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="10%"></td><td width="90%">
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<b>rgb2ycbcr</b> [ <i>options</i> ] <i>src1.tif src2.tif ...
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dst.tif</i></td></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="10%"></td><td width="90%">
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<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.</td></table>
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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="10%"></td><td width="90%">
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By default, chrominance samples are created by sampling 2 by
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2 blocks of luminance values; this can be changed with the
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<b>-h</b> and <b>-v</b> options. Output data are compressed
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with the <small>PackBits</small> compression scheme, by
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default; an alternate scheme can be selected with the
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<b>-c</b> option. By default, output data are compressed in
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strips with the number of rows in each strip selected so
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that the size of a strip is never more than 8 kilobytes; the
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<b>-r</b> option can be used to explicitly set the number of
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rows per strip.</td></table>
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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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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>-c</b></td></table>
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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="21%"></td><td width="79%">
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Specify a compression scheme to use when writing image data:
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<b>-c none</b> for no compression, <b>-c packbits</b> for
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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 lzw</b> for
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Lempel-Ziv & Welch.</td></table>
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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="10%"></td><td width="90%">
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<b>-h</b></td></table>
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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="21%"></td><td width="79%">
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Set the horizontal sampling dimension to one of: 1, 2
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(default), or 4.</td></table>
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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="10%"></td><td width="90%">
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<b>-r</b></td></table>
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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="21%"></td><td width="79%">
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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.</td></table>
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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="10%"></td><td width="90%">
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<b>-v</b></td></table>
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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="21%"></td><td width="79%">
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Set the vertical sampling dimension to one of: 1, 2
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(default), or 4.</td></table>
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</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="10%"></td><td width="90%">
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<i>tiffinfo</i>(1), <i>tiffcp</i>(1),
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<i>libtiff</i>(3)</td></table>
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<hr>
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</body>
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</html>
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