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1 <!-- Creator : groff version 1.18.1 --> |
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2 <!-- CreationDate: Mon Mar 13 18:03:13 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>TIFFMEDIAN</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>TIFFMEDIAN</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="#NOTES">NOTES</a><br> |
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17 <a href="#SEE ALSO">SEE ALSO</a><br> |
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18 |
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19 <hr> |
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20 <a name="NAME"></a> |
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21 <h2>NAME</h2> |
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22 <!-- INDENTATION --> |
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24 cols="2" cellspacing="0" cellpadding="0"> |
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25 <tr valign="top" align="left"> |
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26 <td width="8%"></td> |
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27 <td width="91%"> |
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28 <p>tiffmedian − apply the median cut algorithm to data |
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29 in a <small>TIFF</small> file</p> |
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30 </td> |
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31 </table> |
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32 <a name="SYNOPSIS"></a> |
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33 <h2>SYNOPSIS</h2> |
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34 <!-- INDENTATION --> |
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39 <td width="91%"> |
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40 <p><b>tiffmedian</b> [ <i>options</i> ] <i>input.tif |
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41 output.tif</i></p> |
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42 </td> |
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43 </table> |
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44 <a name="DESCRIPTION"></a> |
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45 <h2>DESCRIPTION</h2> |
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46 <!-- INDENTATION --> |
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48 cols="2" cellspacing="0" cellpadding="0"> |
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50 <td width="8%"></td> |
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51 <td width="91%"> |
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52 <p><i>tiffmedian</i> applies the median cut algorithm to an |
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53 <small>RGB</small> image in <i>input.tif</i> to generate a |
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54 palette image that is written to <i>output.tif</i>. The |
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55 generated colormap has, by default, 256 entries. The image |
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56 data is quantized by mapping each pixel to the closest color |
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57 values in the colormap.</p> |
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58 </td> |
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59 </table> |
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60 <a name="OPTIONS"></a> |
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61 <h2>OPTIONS</h2> |
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62 <!-- TABS --> |
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63 <table width="100%" border=0 rules="none" frame="void" |
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64 cols="5" cellspacing="0" cellpadding="0"> |
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65 <tr valign="top" align="left"> |
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66 <td width="11%"></td> |
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67 <td width="2%"> |
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68 |
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69 <p><b>−c</b></p> |
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70 </td> |
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71 <td width="5%"></td> |
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72 <td width="80%"> |
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73 |
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74 <p>Specify the compression to use for data written to the |
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75 output file: <b>none</b> for no compression, <b>packbits</b> |
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76 for PackBits compression, <b>lzw</b> for Lempel-Ziv & |
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77 Welch compression, and <b>zip</b> for Deflate compression. |
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78 By default <i>tiffmedian</i> will compress data according to |
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79 the value of the <i>Compression</i> tag found in the source |
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80 file.</p> |
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81 </td> |
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82 <td width="0%"> |
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83 </td> |
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84 </table> |
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85 <!-- INDENTATION --> |
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86 <table width="100%" border=0 rules="none" frame="void" |
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87 cols="2" cellspacing="0" cellpadding="0"> |
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88 <tr valign="top" align="left"> |
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89 <td width="17%"></td> |
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90 <td width="82%"> |
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91 <p><small>LZW</small> compression can be specified together |
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92 with a <i>predictor</i> value. A predictor value of 2 causes |
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93 each scanline of the output image to undergo horizontal |
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94 differencing before it is encoded; a value of 1 forces each |
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95 scanline to be encoded without differencing. LZW-specific |
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96 options are specified by appending a |
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97 ‘‘:’’-separated list to the |
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98 ‘‘lzw’’ option; e.g. <b>−c |
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99 lzw:2</b> for <small>LZW</small> compression with horizontal |
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100 differencing.</p> |
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101 </td> |
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102 </table> |
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103 <!-- TABS --> |
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104 <table width="100%" border=0 rules="none" frame="void" |
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105 cols="5" cellspacing="0" cellpadding="0"> |
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106 <tr valign="top" align="left"> |
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107 <td width="10%"></td> |
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108 <td width="2%"> |
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109 |
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110 <p><b>−C</b></p> |
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111 </td> |
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112 <td width="6%"></td> |
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113 <td width="80%"> |
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114 |
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115 <p>Specify the number of entries to use in the generated |
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116 colormap. By default all 256 entries/colors are used.</p> |
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117 </td> |
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118 <td width="0%"> |
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119 </td> |
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120 <tr valign="top" align="left"> |
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121 <td width="10%"></td> |
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122 <td width="2%"> |
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123 |
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124 <p><b>−f</b></p> |
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125 </td> |
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126 <td width="6%"></td> |
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127 <td width="80%"> |
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128 |
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129 <p>Apply Floyd-Steinberg dithering before selecting a |
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130 colormap entry.</p> |
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131 </td> |
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132 <td width="0%"> |
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133 </td> |
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134 <tr valign="top" align="left"> |
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135 <td width="10%"></td> |
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136 <td width="2%"> |
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137 |
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138 <p><b>−r</b></p> |
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139 </td> |
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140 <td width="6%"></td> |
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141 <td width="80%"> |
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142 |
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143 <p>Specify the number of rows (scanlines) in each strip of |
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144 data written to the output file. By default, |
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145 <i>tiffmedian</i> attempts to set the rows/strip that no |
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146 more than 8 kilobytes of data appear in a strip.</p> |
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147 </td> |
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148 <td width="0%"> |
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149 </td> |
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150 </table> |
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151 <a name="NOTES"></a> |
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152 <h2>NOTES</h2> |
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153 <!-- INDENTATION --> |
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156 <tr valign="top" align="left"> |
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157 <td width="8%"></td> |
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158 <td width="91%"> |
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159 <p>This program is derived from Paul Heckbert’s |
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160 <i>median</i> program.</p> |
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161 </td> |
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162 </table> |
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163 <a name="SEE ALSO"></a> |
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164 <h2>SEE ALSO</h2> |
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165 <!-- INDENTATION --> |
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168 <tr valign="top" align="left"> |
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169 <td width="8%"></td> |
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170 <td width="91%"> |
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171 <p><b>pal2rgb</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1), |
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172 <b>tiffcmp</b>(1), <b>libtiff</b>(3TIFF)</p> |
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173 <!-- INDENTATION --> |
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174 <p><b>Color Image Quantization for Frame Buffer Display</b>, |
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175 Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.</p> |
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176 <!-- INDENTATION --> |
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177 <p>Libtiff library home page: |
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178 <b>http://www.remotesensing.org/libtiff/</b></p> |
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179 </td> |
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180 </table> |
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181 <hr> |
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182 </body> |
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183 </html> |