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5 <meta name="generator" content="groff -Thtml, see www.gnu.org">
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7 <title>RGB2YCBCR</title>
8 </head>
9 <body>
10
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>
28 images to a YCbCr <small>TIFF</small> image</p>
29 </td>
30 </table>
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>
41 </td>
42 </table>
43 <a name="DESCRIPTION"></a>
44 <h2>DESCRIPTION</h2>
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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
56 file.</p>
57 <!-- INDENTATION -->
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>&minus;h</b> and <b>&minus;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>&minus;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>&minus;r</b> option can be used to
67 explicitly set the number of rows per strip.</p>
68 </td>
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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82 <td width="80%">
83
84 <p>Specify a compression scheme to use when writing image
85 data: <b>&minus;c none</b> for no compression, <b>&minus;c
86 packbits</b> for the PackBits compression algorithm (the
87 default), <b>&minus;c jpeg</b> for the JPEG compression
88 algorithm, <b>&minus;c zip</b> for the deflate compression
89 algorithm, and <b>&minus;c lzw</b> for Lempel-Ziv &amp;
90 Welch.</p>
91 </td>
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93 </td>
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97
98 <p><b>&minus;h</b></p>
99 </td>
100 <td width="5%"></td>
101 <td width="80%">
102
103 <p>Set the horizontal sampling dimension to one of: 1, 2
104 (default), or 4.</p>
105 </td>
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107 </td>
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109 <td width="10%"></td>
110 <td width="3%">
111
112 <p><b>&minus;r</b></p>
113 </td>
114 <td width="5%"></td>
115 <td width="80%">
116
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>
120 </td>
121 <td width="0%">
122 </td>
123 <tr valign="top" align="left">
124 <td width="10%"></td>
125 <td width="3%">
126
127 <p><b>&minus;v</b></p>
128 </td>
129 <td width="5%"></td>
130 <td width="80%">
131
132 <p>Set the vertical sampling dimension to one of: 1, 2
133 (default), or 4.</p>
134 </td>
135 <td width="0%">
136 </td>
137 </table>
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.remotesensing.org/libtiff</b></p>
151 </td>
152 </table>
153 <hr>
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155 </html>