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7<title>RGB2YCBCR</title>
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11<h1 align=center>RGB2YCBCR</h1>
12<a href="#NAME">NAME</a><br>
13<a href="#SYNOPSIS">SYNOPSIS</a><br>
14<a href="#DESCRIPTION">DESCRIPTION</a><br>
15<a href="#OPTIONS">OPTIONS</a><br>
16<a href="#SEE ALSO">SEE ALSO</a><br>
17
18<hr>
19<a name="NAME"></a>
20<h2>NAME</h2>
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27<p>rgb2ycbcr &minus; convert non-YCbCr <small>TIFF</small>
28images to a YCbCr <small>TIFF</small> image</p>
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31<a name="SYNOPSIS"></a>
32<h2>SYNOPSIS</h2>
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39<p><b>rgb2ycbcr</b> [ <i>options</i> ] <i>src1.tif src2.tif
40... dst.tif</i></p>
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43<a name="DESCRIPTION"></a>
44<h2>DESCRIPTION</h2>
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51<p><i>rgb2ycbcr</i> converts <small>RGB</small> color,
52greyscale, or bi-level <small>TIFF</small> images to YCbCr
53images by transforming and sampling pixel data. If multiple
54files are specified on the command line each source file is
55converted to a separate directory in the destination
56file.</p>
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58<p>By default, chrominance samples are created by sampling 2
59by 2 blocks of luminance values; this can be changed with
60the <b>&minus;h</b> and <b>&minus;v</b> options. Output data
61are compressed with the <small>PackBits</small> compression
62scheme, by default; an alternate scheme can be selected with
63the <b>&minus;c</b> option. By default, output data are
64compressed in strips with the number of rows in each strip
65selected so that the size of a strip is never more than 8
66kilobytes; the <b>&minus;r</b> option can be used to
67explicitly set the number of rows per strip.</p>
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69</table>
70<a name="OPTIONS"></a>
71<h2>OPTIONS</h2>
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78
79<p><b>&minus;c</b></p>
80</td>
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83
84<p>Specify a compression scheme to use when writing image
85data: <b>&minus;c none</b> for no compression, <b>&minus;c
86packbits</b> for the PackBits compression algorithm (the
87default), <b>&minus;c jpeg</b> for the JPEG compression
88algorithm, <b>&minus;c zip</b> for the deflate compression
89algorithm, and <b>&minus;c lzw</b> for Lempel-Ziv &amp;
90Welch.</p>
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97
98<p><b>&minus;h</b></p>
99</td>
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102
103<p>Set the horizontal sampling dimension to one of: 1, 2
104(default), or 4.</p>
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111
112<p><b>&minus;r</b></p>
113</td>
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116
117<p>Write data with a specified number of rows per strip; by
118default the number of rows/strip is selected so that each
119strip is approximately 8 kilobytes.</p>
120</td>
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122</td>
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126
127<p><b>&minus;v</b></p>
128</td>
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131
132<p>Set the vertical sampling dimension to one of: 1, 2
133(default), or 4.</p>
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136</td>
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138<a name="SEE ALSO"></a>
139<h2>SEE ALSO</h2>
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146<p><b>tiffinfo</b>(1), <b>tiffcp</b>(1),
147<b>libtiff</b>(3)</p>
148<!-- INDENTATION -->
149<p>Libtiff library home page:
150<b>http://www.simplesystems.org/libtiff/</b></p>
151</td>
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