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5<meta name="generator" content="groff -Thtml, see www.gnu.org">
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7<title>TIFFMEDIAN</title>
8</head>
9<body>
10
11<h1 align=center>TIFFMEDIAN</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>
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28<p>tiffmedian &minus; apply the median cut algorithm to data
29in a <small>TIFF</small> file</p>
30</td>
31</table>
32<a name="SYNOPSIS"></a>
33<h2>SYNOPSIS</h2>
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40<p><b>tiffmedian</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 -->
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52<p><i>tiffmedian</i> applies the median cut algorithm to an
53<small>RGB</small> image in <i>input.tif</i> to generate a
54palette image that is written to <i>output.tif</i>. The
55generated colormap has, by default, 256 entries. The image
56data is quantized by mapping each pixel to the closest color
57values in the colormap.</p>
58</td>
59</table>
60<a name="OPTIONS"></a>
61<h2>OPTIONS</h2>
62<!-- TABS -->
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68
69<p><b>&minus;c</b></p>
70</td>
71<td width="5%"></td>
72<td width="80%">
73
74<p>Specify the compression to use for data written to the
75output file: <b>none</b> for no compression, <b>packbits</b>
76for PackBits compression, <b>lzw</b> for Lempel-Ziv &amp;
77Welch compression, and <b>zip</b> for Deflate compression.
78By default <i>tiffmedian</i> will compress data according to
79the value of the <i>Compression</i> tag found in the source
80file.</p>
81</td>
82<td width="0%">
83</td>
84</table>
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90<td width="82%">
91<p><small>LZW</small> compression can be specified together
92with a <i>predictor</i> value. A predictor value of 2 causes
93each scanline of the output image to undergo horizontal
94differencing before it is encoded; a value of 1 forces each
95scanline to be encoded without differencing. LZW-specific
96options are specified by appending a
97&lsquo;&lsquo;:&rsquo;&rsquo;-separated list to the
98&lsquo;&lsquo;lzw&rsquo;&rsquo; option; e.g. <b>&minus;c
99lzw:2</b> for <small>LZW</small> compression with horizontal
100differencing.</p>
101</td>
102</table>
103<!-- TABS -->
104<table width="100%" border=0 rules="none" frame="void"
105 cols="5" cellspacing="0" cellpadding="0">
106<tr valign="top" align="left">
107<td width="10%"></td>
108<td width="2%">
109
110<p><b>&minus;C</b></p>
111</td>
112<td width="6%"></td>
113<td width="80%">
114
115<p>Specify the number of entries to use in the generated
116colormap. By default all 256 entries/colors are used.</p>
117</td>
118<td width="0%">
119</td>
120<tr valign="top" align="left">
121<td width="10%"></td>
122<td width="2%">
123
124<p><b>&minus;f</b></p>
125</td>
126<td width="6%"></td>
127<td width="80%">
128
129<p>Apply Floyd-Steinberg dithering before selecting a
130colormap entry.</p>
131</td>
132<td width="0%">
133</td>
134<tr valign="top" align="left">
135<td width="10%"></td>
136<td width="2%">
137
138<p><b>&minus;r</b></p>
139</td>
140<td width="6%"></td>
141<td width="80%">
142
143<p>Specify the number of rows (scanlines) in each strip of
144data written to the output file. By default,
145<i>tiffmedian</i> attempts to set the rows/strip that no
146more than 8 kilobytes of data appear in a strip.</p>
147</td>
148<td width="0%">
149</td>
150</table>
151<a name="NOTES"></a>
152<h2>NOTES</h2>
153<!-- INDENTATION -->
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157<td width="8%"></td>
158<td width="91%">
159<p>This program is derived from Paul Heckbert&rsquo;s
160<i>median</i> program.</p>
161</td>
162</table>
163<a name="SEE ALSO"></a>
164<h2>SEE ALSO</h2>
165<!-- INDENTATION -->
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170<td width="91%">
171<p><b>pal2rgb</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1),
172<b>tiffcmp</b>(1), <b>libtiff</b>(3TIFF)</p>
173<!-- INDENTATION -->
174<p><b>Color Image Quantization for Frame Buffer Display</b>,
175Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.</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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