src/tiff/html/man/rgb2ycbcr.1.html

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   7 <title>RGB2YCBCR</title>
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  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>
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  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>
  72 <!-- TABS -->
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  78
  79 <p><b>&minus;c</b></p>
  80 </td>
  81 <td width="5%"></td>
  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>
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 101 <td width="80%">
 102
 103 <p>Set the horizontal sampling dimension to one of: 1, 2
 104 (default), or 4.</p>
 105 </td>
 106 <td width="0%">
 107 </td>
 108 <tr valign="top" align="left">
 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>
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 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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