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7 <title>RGB2YCBCR</title>
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>
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27 <p>rgb2ycbcr − convert non-YCbCr <small>TIFF</small>
28 images to a YCbCr <small>TIFF</small> image</p>
31 <a name="SYNOPSIS"></a>
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39 <p><b>rgb2ycbcr</b> [ <i>options</i> ] <i>src1.tif src2.tif
43 <a name="DESCRIPTION"></a>
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51 <p><i>rgb2ycbcr</i> converts <small>RGB</small> color,
52 greyscale, or bi-level <small>TIFF</small> images to YCbCr
53 images by transforming and sampling pixel data. If multiple
54 files are specified on the command line each source file is
55 converted to a separate directory in the destination
58 <p>By default, chrominance samples are created by sampling 2
59 by 2 blocks of luminance values; this can be changed with
60 the <b>−h</b> and <b>−v</b> options. Output data
61 are compressed with the <small>PackBits</small> compression
62 scheme, by default; an alternate scheme can be selected with
63 the <b>−c</b> option. By default, output data are
64 compressed in strips with the number of rows in each strip
65 selected so that the size of a strip is never more than 8
66 kilobytes; the <b>−r</b> option can be used to
67 explicitly set the number of rows per strip.</p>
70 <a name="OPTIONS"></a>
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79 <p><b>−c</b></p>
84 <p>Specify a compression scheme to use when writing image
85 data: <b>−c none</b> for no compression, <b>−c
86 packbits</b> for the PackBits compression algorithm (the
87 default), <b>−c jpeg</b> for the JPEG compression
88 algorithm, <b>−c zip</b> for the deflate compression
89 algorithm, and <b>−c lzw</b> for Lempel-Ziv &
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98 <p><b>−h</b></p>
103 <p>Set the horizontal sampling dimension to one of: 1, 2
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109 <td width="10%"></td>
112 <p><b>−r</b></p>
117 <p>Write data with a specified number of rows per strip; by
118 default the number of rows/strip is selected so that each
119 strip is approximately 8 kilobytes.</p>
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124 <td width="10%"></td>
127 <p><b>−v</b></p>
132 <p>Set the vertical sampling dimension to one of: 1, 2
138 <a name="SEE ALSO"></a>
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146 <p><b>tiffinfo</b>(1), <b>tiffcp</b>(1),
147 <b>libtiff</b>(3)</p>
149 <p>Libtiff library home page:
150 <b>http://www.remotesensing.org/libtiff</b></p>