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1<!-- Creator : groff version 1.18.1 -->
2<!-- CreationDate: Sat Feb 24 18:37:20 2007 -->
3<html>
4<head>
5<meta name="generator" content="groff -Thtml, see www.gnu.org">
6<meta name="Content-Style" content="text/css">
7<title>TIFFDITHER</title>
8</head>
9<body>
10
11<h1 align=center>TIFFDITHER</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="#NOTES">NOTES</a><br>
17<a href="#SEE ALSO">SEE ALSO</a><br>
18
19<hr>
20<a name="NAME"></a>
21<h2>NAME</h2>
22<!-- INDENTATION -->
23<table width="100%" border=0 rules="none" frame="void"
24 cols="2" cellspacing="0" cellpadding="0">
25<tr valign="top" align="left">
26<td width="8%"></td>
27<td width="91%">
28<p>tiffdither &minus; convert a greyscale image to bilevel
29using dithering</p>
30</td>
31</table>
32<a name="SYNOPSIS"></a>
33<h2>SYNOPSIS</h2>
34<!-- INDENTATION -->
35<table width="100%" border=0 rules="none" frame="void"
36 cols="2" cellspacing="0" cellpadding="0">
37<tr valign="top" align="left">
38<td width="8%"></td>
39<td width="91%">
40<p><b>tiffdither</b> [ <i>options</i> ] <i>input.tif
41output.tif</i></p>
42</td>
43</table>
44<a name="DESCRIPTION"></a>
45<h2>DESCRIPTION</h2>
46<!-- INDENTATION -->
47<table width="100%" border=0 rules="none" frame="void"
48 cols="2" cellspacing="0" cellpadding="0">
49<tr valign="top" align="left">
50<td width="8%"></td>
51<td width="91%">
52<p><i>tiffdither</i> converts a single channel 8-bit
53greyscale image to a bilevel image using Floyd-Steinberg
54error propagation with thresholding.</p>
55</td>
56</table>
57<a name="OPTIONS"></a>
58<h2>OPTIONS</h2>
59<!-- TABS -->
60<table width="100%" border=0 rules="none" frame="void"
61 cols="5" cellspacing="0" cellpadding="0">
62<tr valign="top" align="left">
63<td width="10%"></td>
64<td width="2%">
65
66<p><b>&minus;c</b></p>
67</td>
68<td width="6%"></td>
69<td width="80%">
70
71<p>Specify the compression to use for data written to the
72output file: <b>none</b> for no compression, <b>packbits</b>
73for PackBits compression, <b>lzw</b> for Lempel-Ziv &amp;
74Welch compression, <b>zip</b> for Deflate compression,
75<b>g3</b> for CCITT Group 3 (T.4) compression, and <b>g4</b>
76for CCITT Group 4 (T.6) compression. By default
77<i>tiffdither</i> will compress data according to the value
78of the <i>Compression</i> tag found in the source file.</p>
79</td>
80<td width="0%">
81</td>
82</table>
83<!-- INDENTATION -->
84<table width="100%" border=0 rules="none" frame="void"
85 cols="2" cellspacing="0" cellpadding="0">
86<tr valign="top" align="left">
87<td width="17%"></td>
88<td width="82%">
89<p>The <small>CCITT</small> Group 3 and Group 4 compression
90algorithms can only be used with bilevel data.</p>
91<!-- INDENTATION -->
92<p>Group 3 compression can be specified together with
93several T.4-specific options: <b>1d</b> for 1-dimensional
94encoding, <b>2d</b> for 2-dimensional encoding, and
95<b>fill</b> to force each encoded scanline to be zero-filled
96so that the terminating EOL code lies on a byte boundary.
97Group 3-specific options are specified by appending a
98&lsquo;&lsquo;:&rsquo;&rsquo;-separated list to the
99&lsquo;&lsquo;g3&rsquo;&rsquo; option; e.g. <b>&minus;c
100g3:2d:fill</b> to get 2D-encoded data with byte-aligned EOL
101codes.</p>
102<!-- INDENTATION -->
103<p><small>LZW</small> compression can be specified together
104with a <i>predictor</i> value. A predictor value of 2 causes
105each scanline of the output image to undergo horizontal
106differencing before it is encoded; a value of 1 forces each
107scanline to be encoded without differencing. LZW-specific
108options are specified by appending a
109&lsquo;&lsquo;:&rsquo;&rsquo;-separated list to the
110&lsquo;&lsquo;lzw&rsquo;&rsquo; option; e.g. <b>&minus;c
111lzw:2</b> for <small>LZW</small> compression with horizontal
112differencing.</p>
113</td>
114</table>
115<!-- TABS -->
116<table width="100%" border=0 rules="none" frame="void"
117 cols="5" cellspacing="0" cellpadding="0">
118<tr valign="top" align="left">
119<td width="10%"></td>
120<td width="3%">
121
122<p><b>&minus;f</b></p>
123</td>
124<td width="5%"></td>
125<td width="80%">
126
127<p>Specify the bit fill order to use in writing output
128data. By default, <i>tiffdither</i> will create a new file
129with the same fill order as the original. Specifying
130<b>&minus;f lsb2msb</b> will force data to be written with
131the <i>FillOrder</i> tag set to <small>LSB2MSB ,</small>
132while <b>&minus;f msb2lsb</b> will force data to be written
133with the <i>Fill- Order</i> tag set to <small>MSB2LSB
134.</small></p>
135</td>
136<td width="0%">
137</td>
138<tr valign="top" align="left">
139<td width="10%"></td>
140<td width="3%">
141
142<p><b>&minus;t</b></p>
143</td>
144<td width="5%"></td>
145<td width="80%">
146
147<p>Set the threshold value for dithering. By default the
148threshold value is 128.</p>
149</td>
150<td width="0%">
151</td>
152</table>
153<a name="NOTES"></a>
154<h2>NOTES</h2>
155<!-- INDENTATION -->
156<table width="100%" border=0 rules="none" frame="void"
157 cols="2" cellspacing="0" cellpadding="0">
158<tr valign="top" align="left">
159<td width="8%"></td>
160<td width="91%">
161<p>The dither algorithm is taken from the
162<b>tiffmedian</b>(1) program (written by Paul Heckbert).</p>
163</td>
164</table>
165<a name="SEE ALSO"></a>
166<h2>SEE ALSO</h2>
167<!-- INDENTATION -->
168<table width="100%" border=0 rules="none" frame="void"
169 cols="2" cellspacing="0" cellpadding="0">
170<tr valign="top" align="left">
171<td width="8%"></td>
172<td width="91%">
173<p><b>pal2rgb</b>(1), <b>fax2tiff</b>(1),
174<b>tiffinfo</b>(1), <b>tiffcp</b>(1), <b>tiff2bw</b>(1),
175<b>libtiff</b>(3TIFF)</p>
176<!-- INDENTATION -->
177<p>Libtiff library home page:
178<b>http://www.remotesensing.org/libtiff/</b></p>
179</td>
180</table>
181<hr>
182</body>
183</html>
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