| author | eckhart.koppen@nokia.com |
| Wed, 31 Mar 2010 11:06:36 +0300 | |
| changeset 7 | f7bc934e204c |
| permissions | -rw-r--r-- |
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<html> |
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<head> |
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<meta name="generator" content="groff -Thtml, see www.gnu.org"> |
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<meta name="Content-Style" content="text/css"> |
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<title>TIFFMEDIAN</title> |
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</head> |
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<body> |
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<h1 align=center>TIFFMEDIAN</h1> |
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<a href="#NAME">NAME</a><br> |
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<a href="#SYNOPSIS">SYNOPSIS</a><br> |
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<a href="#DESCRIPTION">DESCRIPTION</a><br> |
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<a href="#OPTIONS">OPTIONS</a><br> |
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<a href="#NOTES">NOTES</a><br> |
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<a href="#SEE ALSO">SEE ALSO</a><br> |
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<hr> |
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<a name="NAME"></a> |
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<h2>NAME</h2> |
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<!-- INDENTATION --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="2" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="8%"></td> |
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<td width="91%"> |
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<p>tiffmedian − apply the median cut algorithm to data |
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in a <small>TIFF</small> file</p> |
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</td> |
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</table> |
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<a name="SYNOPSIS"></a> |
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<h2>SYNOPSIS</h2> |
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<!-- INDENTATION --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="2" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="8%"></td> |
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<td width="91%"> |
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<p><b>tiffmedian</b> [ <i>options</i> ] <i>input.tif |
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output.tif</i></p> |
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</td> |
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</table> |
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<a name="DESCRIPTION"></a> |
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<h2>DESCRIPTION</h2> |
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<!-- INDENTATION --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="2" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="8%"></td> |
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<td width="91%"> |
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<p><i>tiffmedian</i> applies the median cut algorithm to an |
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<small>RGB</small> image in <i>input.tif</i> to generate a |
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palette image that is written to <i>output.tif</i>. The |
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generated colormap has, by default, 256 entries. The image |
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data is quantized by mapping each pixel to the closest color |
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values in the colormap.</p> |
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</td> |
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</table> |
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<a name="OPTIONS"></a> |
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<h2>OPTIONS</h2> |
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<!-- TABS --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="5" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="11%"></td> |
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<td width="2%"> |
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<p><b>−c</b></p> |
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</td> |
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<td width="5%"></td> |
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<td width="80%"> |
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<p>Specify the compression to use for data written to the |
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output file: <b>none</b> for no compression, <b>packbits</b> |
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for PackBits compression, <b>lzw</b> for Lempel-Ziv & |
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Welch compression, and <b>zip</b> for Deflate compression. |
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By default <i>tiffmedian</i> will compress data according to |
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the value of the <i>Compression</i> tag found in the source |
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file.</p> |
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</td> |
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<td width="0%"> |
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</td> |
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</table> |
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<!-- INDENTATION --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="2" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="17%"></td> |
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<td width="82%"> |
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<p><small>LZW</small> compression can be specified together |
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with a <i>predictor</i> value. A predictor value of 2 causes |
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each scanline of the output image to undergo horizontal |
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differencing before it is encoded; a value of 1 forces each |
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scanline to be encoded without differencing. LZW-specific |
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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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154 |
<table width="100%" border=0 rules="none" frame="void" |
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155 |
cols="2" cellspacing="0" cellpadding="0"> |
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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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166 |
<table width="100%" border=0 rules="none" frame="void" |
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167 |
cols="2" cellspacing="0" cellpadding="0"> |
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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> |