| 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>TIFFDITHER</title> |
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</head> |
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<body> |
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<h1 align=center>TIFFDITHER</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>tiffdither − convert a greyscale image to bilevel |
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using dithering</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>tiffdither</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>tiffdither</i> converts a single channel 8-bit |
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greyscale image to a bilevel image using Floyd-Steinberg |
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error propagation with thresholding.</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="10%"></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="6%"></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, <b>zip</b> for Deflate compression, |
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<b>g3</b> for CCITT Group 3 (T.4) compression, and <b>g4</b> |
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for CCITT Group 4 (T.6) compression. By default |
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<i>tiffdither</i> will compress data according to the value |
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of the <i>Compression</i> tag found in the source 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>The <small>CCITT</small> Group 3 and Group 4 compression |
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algorithms can only be used with bilevel data.</p> |
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<!-- INDENTATION --> |
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<p>Group 3 compression can be specified together with |
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several T.4-specific options: <b>1d</b> for 1-dimensional |
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encoding, <b>2d</b> for 2-dimensional encoding, and |
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<b>fill</b> to force each encoded scanline to be zero-filled |
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so that the terminating EOL code lies on a byte boundary. |
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97 |
Group 3-specific options are specified by appending a |
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98 |
‘‘:’’-separated list to the |
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99 |
‘‘g3’’ option; e.g. <b>−c |
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100 |
g3:2d:fill</b> to get 2D-encoded data with byte-aligned EOL |
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101 |
codes.</p> |
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102 |
<!-- INDENTATION --> |
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103 |
<p><small>LZW</small> compression can be specified together |
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104 |
with a <i>predictor</i> value. A predictor value of 2 causes |
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105 |
each scanline of the output image to undergo horizontal |
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106 |
differencing before it is encoded; a value of 1 forces each |
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107 |
scanline to be encoded without differencing. LZW-specific |
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108 |
options are specified by appending a |
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109 |
‘‘:’’-separated list to the |
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110 |
‘‘lzw’’ option; e.g. <b>−c |
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111 |
lzw:2</b> for <small>LZW</small> compression with horizontal |
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112 |
differencing.</p> |
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113 |
</td> |
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114 |
</table> |
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115 |
<!-- TABS --> |
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116 |
<table width="100%" border=0 rules="none" frame="void" |
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117 |
cols="5" cellspacing="0" cellpadding="0"> |
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118 |
<tr valign="top" align="left"> |
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119 |
<td width="10%"></td> |
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120 |
<td width="3%"> |
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121 |
|
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122 |
<p><b>−f</b></p> |
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123 |
</td> |
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124 |
<td width="5%"></td> |
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125 |
<td width="80%"> |
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126 |
|
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127 |
<p>Specify the bit fill order to use in writing output |
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128 |
data. By default, <i>tiffdither</i> will create a new file |
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129 |
with the same fill order as the original. Specifying |
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130 |
<b>−f lsb2msb</b> will force data to be written with |
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131 |
the FillOrder tag set to <small>LSB2MSB ,</small> while |
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132 |
<b>−f msb2lsb</b> will force data to be written with |
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133 |
the FillOrder tag set to <small>MSB2LSB .</small></p> |
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134 |
</td> |
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135 |
<td width="0%"> |
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136 |
</td> |
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137 |
<tr valign="top" align="left"> |
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138 |
<td width="10%"></td> |
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139 |
<td width="3%"> |
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140 |
|
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141 |
<p><b>−t</b></p> |
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142 |
</td> |
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143 |
<td width="5%"></td> |
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144 |
<td width="80%"> |
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145 |
|
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146 |
<p>Set the threshold value for dithering. By default the |
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147 |
threshold value is 128.</p> |
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148 |
</td> |
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149 |
<td width="0%"> |
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150 |
</td> |
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151 |
</table> |
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152 |
<a name="NOTES"></a> |
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153 |
<h2>NOTES</h2> |
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154 |
<!-- INDENTATION --> |
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155 |
<table width="100%" border=0 rules="none" frame="void" |
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156 |
cols="2" cellspacing="0" cellpadding="0"> |
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157 |
<tr valign="top" align="left"> |
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158 |
<td width="8%"></td> |
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159 |
<td width="91%"> |
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160 |
<p>The dither algorithm is taken from the |
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161 |
<b>tiffmedian</b>(1) program (written by Paul Heckbert).</p> |
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162 |
</td> |
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163 |
</table> |
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164 |
<a name="SEE ALSO"></a> |
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165 |
<h2>SEE ALSO</h2> |
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166 |
<!-- INDENTATION --> |
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167 |
<table width="100%" border=0 rules="none" frame="void" |
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168 |
cols="2" cellspacing="0" cellpadding="0"> |
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169 |
<tr valign="top" align="left"> |
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170 |
<td width="8%"></td> |
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171 |
<td width="91%"> |
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172 |
<p><b>pal2rgb</b>(1), <b>fax2tiff</b>(1), |
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173 |
<b>tiffinfo</b>(1), <b>tiffcp</b>(1), <b>tiff2bw</b>(1), |
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174 |
<b>libtiff</b>(3TIFF)</p> |
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175 |
<!-- INDENTATION --> |
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176 |
<p>Libtiff library home page: |
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177 |
<b>http://www.remotesensing.org/libtiff/</b></p> |
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178 |
</td> |
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179 |
</table> |
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180 |
<hr> |
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181 |
</body> |
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182 |
</html> |