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3<html>
4<head>
5<meta name="generator" content="groff -Thtml, see www.gnu.org">
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7<title>TIFF2BW</title>
8</head>
9<body>
10
11<h1 align=center>TIFF2BW</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>tiff2bw &minus; convert a color <small>TIFF</small> image
28to greyscale</p>
29</td>
30</table>
31<a name="SYNOPSIS"></a>
32<h2>SYNOPSIS</h2>
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80ed523f 39<p><b>tiff2bw</b> [ <i>options</i> ] <i>input.tif
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40output.tif</i></p>
41</td>
42</table>
43<a name="DESCRIPTION"></a>
44<h2>DESCRIPTION</h2>
45<!-- INDENTATION -->
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51<p><i>Tiff2bw</i> converts an <small>RGB</small> or Palette
52color <small>TIFF</small> image to a greyscale image by
53combining percentages of the red, green, and blue channels.
54By default, output samples are created by taking 28% of the
55red channel, 59% of the green channel, and 11% of the blue
56channel. To alter these percentages, the <b>&minus;R</b>,
57<b>&minus;G</b>, and <b>&minus;B</b> options may be
58used.</p>
59</td>
60</table>
61<a name="OPTIONS"></a>
62<h2>OPTIONS</h2>
63<!-- TABS -->
64<table width="100%" border=0 rules="none" frame="void"
65 cols="5" cellspacing="0" cellpadding="0">
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69
70<p><b>&minus;c</b></p>
71</td>
72<td width="5%"></td>
73<td width="80%">
74
75<p>Specify a compression scheme to use when writing image
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76data: <b>&minus;c none</b> for no compression, <b>&minus;c
77packbits</b> for the PackBits compression algorithm,
78<b>&minus;c zip</b> for the Deflate compression algorithm,
79<b>&minus;c g3</b> for the CCITT Group 3 compression
80algorithm, <b>&minus;c g4</b> for the CCITT Group 4
81compression algorithm, and <b>&minus;c lzw</b> for
82Lempel-Ziv &amp; Welch (the default).</p>
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83</td>
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85</td>
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88<td width="3%">
89
90<p><b>&minus;r</b></p>
91</td>
92<td width="5%"></td>
93<td width="80%">
94
95<p>Write data with a specified number of rows per strip; by
96default the number of rows/strip is selected so that each
97strip is approximately 8 kilobytes.</p>
98</td>
99<td width="0%">
100</td>
101<tr valign="top" align="left">
102<td width="10%"></td>
103<td width="3%">
104
105<p><b>&minus;R</b></p>
106</td>
107<td width="5%"></td>
108<td width="80%">
109
110<p>Specify the percentage of the red channel to use
111(default 28).</p>
112</td>
113<td width="0%">
114</td>
115<tr valign="top" align="left">
116<td width="10%"></td>
117<td width="3%">
118
119<p><b>&minus;G</b></p>
120</td>
121<td width="5%"></td>
122<td width="80%">
123
124<p>Specify the percentage of the green channel to use
125(default 59).</p>
126</td>
127<td width="0%">
128</td>
129<tr valign="top" align="left">
130<td width="10%"></td>
131<td width="3%">
132
133<p><b>&minus;B</b></p>
134</td>
135<td width="5%"></td>
136<td width="80%">
137
138<p>Specify the percentage of the blue channel to use
139(default 11).</p>
140</td>
141<td width="0%">
142</td>
143</table>
144<a name="SEE ALSO"></a>
145<h2>SEE ALSO</h2>
146<!-- INDENTATION -->
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148 cols="2" cellspacing="0" cellpadding="0">
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151<td width="91%">
152<p><b>pal2rgb</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1),
153<b>tiffmedian</b>(1), <b>libtiff</b>(3)</p>
154<!-- INDENTATION -->
155<p>Libtiff library home page:
156<b>http://www.remotesensing.org/libtiff/</b></p>
157</td>
158</table>
159<hr>
160</body>
161</html>