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2 <!-- CreationDate: Mon Mar 13 18:03:12 2006 --> |
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4 <head> |
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5 <meta name="generator" content="groff -Thtml, see www.gnu.org"> |
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6 <meta name="Content-Style" content="text/css"> |
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7 <title>RGB2YCBCR</title> |
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8 </head> |
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9 <body> |
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10 |
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11 <h1 align=center>RGB2YCBCR</h1> |
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12 <a href="#NAME">NAME</a><br> |
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13 <a href="#SYNOPSIS">SYNOPSIS</a><br> |
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14 <a href="#DESCRIPTION">DESCRIPTION</a><br> |
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15 <a href="#OPTIONS">OPTIONS</a><br> |
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16 <a href="#SEE ALSO">SEE ALSO</a><br> |
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17 |
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18 <hr> |
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19 <a name="NAME"></a> |
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20 <h2>NAME</h2> |
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25 <td width="8%"></td> |
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26 <td width="91%"> |
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27 <p>rgb2ycbcr − convert non-YCbCr <small>TIFF</small> |
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28 images to a YCbCr <small>TIFF</small> image</p> |
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29 </td> |
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30 </table> |
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31 <a name="SYNOPSIS"></a> |
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32 <h2>SYNOPSIS</h2> |
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33 <!-- INDENTATION --> |
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37 <td width="8%"></td> |
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38 <td width="91%"> |
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39 <p><b>rgb2ycbcr</b> [ <i>options</i> ] <i>src1.tif src2.tif |
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40 ... dst.tif</i></p> |
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41 </td> |
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42 </table> |
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43 <a name="DESCRIPTION"></a> |
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44 <h2>DESCRIPTION</h2> |
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45 <!-- INDENTATION --> |
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47 cols="2" cellspacing="0" cellpadding="0"> |
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49 <td width="8%"></td> |
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50 <td width="91%"> |
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51 <p><i>rgb2ycbcr</i> converts <small>RGB</small> color, |
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52 greyscale, or bi-level <small>TIFF</small> images to YCbCr |
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53 images by transforming and sampling pixel data. If multiple |
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54 files are specified on the command line each source file is |
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55 converted to a separate directory in the destination |
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56 file.</p> |
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57 <!-- INDENTATION --> |
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58 <p>By default, chrominance samples are created by sampling 2 |
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59 by 2 blocks of luminance values; this can be changed with |
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60 the <b>−h</b> and <b>−v</b> options. Output data |
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61 are compressed with the <small>PackBits</small> compression |
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62 scheme, by default; an alternate scheme can be selected with |
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63 the <b>−c</b> option. By default, output data are |
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64 compressed in strips with the number of rows in each strip |
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65 selected so that the size of a strip is never more than 8 |
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66 kilobytes; the <b>−r</b> option can be used to |
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67 explicitly set the number of rows per strip.</p> |
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68 </td> |
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69 </table> |
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70 <a name="OPTIONS"></a> |
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71 <h2>OPTIONS</h2> |
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72 <!-- TABS --> |
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73 <table width="100%" border=0 rules="none" frame="void" |
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78 |
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79 <p><b>−c</b></p> |
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80 </td> |
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81 <td width="5%"></td> |
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82 <td width="80%"> |
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83 |
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84 <p>Specify a compression scheme to use when writing image |
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85 data: <b>−c none</b> for no compression, <b>-c |
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86 packbits</b> for the PackBits compression algorithm (the |
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87 default), <b>-c jpeg</b> for the JPEG compression algorithm, |
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88 <b>-c zip</b> for the deflate compression algorithm, and |
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89 <b>−c lzw</b> for Lempel-Ziv & Welch.</p> |
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90 </td> |
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91 <td width="0%"> |
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92 </td> |
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93 <tr valign="top" align="left"> |
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94 <td width="10%"></td> |
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95 <td width="3%"> |
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96 |
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97 <p><b>−h</b></p> |
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98 </td> |
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99 <td width="5%"></td> |
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100 <td width="80%"> |
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101 |
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102 <p>Set the horizontal sampling dimension to one of: 1, 2 |
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103 (default), or 4.</p> |
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104 </td> |
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105 <td width="0%"> |
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106 </td> |
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107 <tr valign="top" align="left"> |
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108 <td width="10%"></td> |
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109 <td width="3%"> |
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110 |
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111 <p><b>−r</b></p> |
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112 </td> |
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113 <td width="5%"></td> |
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114 <td width="80%"> |
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115 |
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116 <p>Write data with a specified number of rows per strip; by |
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117 default the number of rows/strip is selected so that each |
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118 strip is approximately 8 kilobytes.</p> |
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119 </td> |
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120 <td width="0%"> |
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121 </td> |
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122 <tr valign="top" align="left"> |
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123 <td width="10%"></td> |
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124 <td width="3%"> |
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125 |
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126 <p><b>−v</b></p> |
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127 </td> |
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128 <td width="5%"></td> |
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129 <td width="80%"> |
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130 |
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131 <p>Set the vertical sampling dimension to one of: 1, 2 |
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132 (default), or 4.</p> |
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133 </td> |
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134 <td width="0%"> |
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135 </td> |
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136 </table> |
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137 <a name="SEE ALSO"></a> |
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138 <h2>SEE ALSO</h2> |
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139 <!-- INDENTATION --> |
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144 <td width="91%"> |
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145 <p><b>tiffinfo</b>(1), <b>tiffcp</b>(1), |
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146 <b>libtiff</b>(3)</p> |
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147 <!-- INDENTATION --> |
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148 <p>Libtiff library home page: |
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149 <b>http://www.remotesensing.org/libtiff</b></p> |
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150 </td> |
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151 </table> |
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152 <hr> |
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153 </body> |
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154 </html> |