summaryrefslogtreecommitdiff
path: root/tiff/html/man/tiffmedian.1.html
blob: 59613177c9720e12776a28420accdd483c08b006 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
<!-- Creator     : groff version 1.18.1 -->
<!-- CreationDate: Fri Jul 13 17:43:20 2007 -->
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta name="Content-Style" content="text/css">
<title>TIFFMEDIAN</title>
</head>
<body>

<h1 align=center>TIFFMEDIAN</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#OPTIONS">OPTIONS</a><br>
<a href="#NOTES">NOTES</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>

<hr>
<a name="NAME"></a>
<h2>NAME</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
       cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p>tiffmedian &minus; apply the median cut algorithm to data
in a <small>TIFF</small> file</p>
</td>
</table>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
       cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p><b>tiffmedian</b> [ <i>options</i> ] <i>input.tif
output.tif</i></p>
</td>
</table>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
       cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p><i>tiffmedian</i> applies the median cut algorithm to an
<small>RGB</small> image in <i>input.tif</i> to generate a
palette image that is written to <i>output.tif</i>. The
generated colormap has, by default, 256 entries. The image
data is quantized by mapping each pixel to the closest color
values in the colormap.</p>
</td>
</table>
<a name="OPTIONS"></a>
<h2>OPTIONS</h2>
<!-- TABS -->
<table width="100%" border=0 rules="none" frame="void"
       cols="5" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="2%">

<p><b>&minus;c</b></p>
</td>
<td width="5%"></td>
<td width="80%">

<p>Specify the compression to use for data written to the
output file: <b>none</b> for no compression, <b>packbits</b>
for PackBits compression, <b>lzw</b> for Lempel-Ziv &amp;
Welch compression, and <b>zip</b> for Deflate compression.
By default <i>tiffmedian</i> will compress data according to
the value of the <i>Compression</i> tag found in the source
file.</p>
</td>
<td width="0%">
</td>
</table>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
       cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="17%"></td>
<td width="82%">
<p><small>LZW</small> compression can be specified together
with a <i>predictor</i> value. A predictor value of 2 causes
each scanline of the output image to undergo horizontal
differencing before it is encoded; a value of 1 forces each
scanline to be encoded without differencing. LZW-specific
options are specified by appending a
&lsquo;&lsquo;:&rsquo;&rsquo;-separated list to the
&lsquo;&lsquo;lzw&rsquo;&rsquo; option; e.g. <b>&minus;c
lzw:2</b> for <small>LZW</small> compression with horizontal
differencing.</p>
</td>
</table>
<!-- TABS -->
<table width="100%" border=0 rules="none" frame="void"
       cols="5" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="10%"></td>
<td width="2%">

<p><b>&minus;C</b></p>
</td>
<td width="6%"></td>
<td width="80%">

<p>Specify the number of entries to use in the generated
colormap. By default all 256 entries/colors are used.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="2%">

<p><b>&minus;f</b></p>
</td>
<td width="6%"></td>
<td width="80%">

<p>Apply Floyd-Steinberg dithering before selecting a
colormap entry.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="2%">

<p><b>&minus;r</b></p>
</td>
<td width="6%"></td>
<td width="80%">

<p>Specify the number of rows (scanlines) in each strip of
data written to the output file. By default,
<i>tiffmedian</i> attempts to set the rows/strip that no
more than 8 kilobytes of data appear in a strip.</p>
</td>
<td width="0%">
</td>
</table>
<a name="NOTES"></a>
<h2>NOTES</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
       cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p>This program is derived from Paul Heckbert&rsquo;s
<i>median</i> program.</p>
</td>
</table>
<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
       cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p><b>pal2rgb</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1),
<b>tiffcmp</b>(1), <b>libtiff</b>(3TIFF)</p>
<!-- INDENTATION -->
<p><b>Color Image Quantization for Frame Buffer Display</b>,
Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.</p>
<!-- INDENTATION -->
<p>Libtiff library home page:
<b>http://www.remotesensing.org/libtiff/</b></p>
</td>
</table>
<hr>
</body>
</html>