]> git.saurik.com Git - wxWidgets.git/blob - src/tiff/man/tiffmedian.1
correct typo: s/wxUSE_MENU/&S/
[wxWidgets.git] / src / tiff / man / tiffmedian.1
1 .\" $Id: tiffmedian.1,v 1.3 2005/11/02 11:07:19 dron Exp $
2 .\"
3 .\" Copyright (c) 1990-1997 Sam Leffler
4 .\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
5 .\"
6 .\" Permission to use, copy, modify, distribute, and sell this software and
7 .\" its documentation for any purpose is hereby granted without fee, provided
8 .\" that (i) the above copyright notices and this permission notice appear in
9 .\" all copies of the software and related documentation, and (ii) the names of
10 .\" Sam Leffler and Silicon Graphics may not be used in any advertising or
11 .\" publicity relating to the software without the specific, prior written
12 .\" permission of Sam Leffler and Silicon Graphics.
13 .\"
14 .\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
15 .\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
16 .\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
17 .\"
18 .\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
19 .\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
20 .\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
21 .\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
22 .\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 .\" OF THIS SOFTWARE.
24 .\"
25 .if n .po 0
26 .TH TIFFMEDIAN 1 "November 2, 2005" "libtiff"
27 .SH NAME
28 tiffmedian \- apply the median cut algorithm to data in a
29 .SM TIFF
30 file
31 .SH SYNOPSIS
32 .B tiffmedian
33 [
34 .I options
35 ]
36 .I input.tif
37 .I output.tif
38 .SH DESCRIPTION
39 .I tiffmedian
40 applies the median cut algorithm to an
41 .SM RGB
42 image in
43 .I input.tif
44 to generate a palette image that is written to
45 .IR output.tif .
46 The generated colormap has, by default, 256 entries.
47 The image data is quantized by mapping each
48 pixel to the closest color values in the colormap.
49 .SH OPTIONS
50 .TP
51 .B \-c
52 Specify the compression to use for data written to the output file:
53 .B none
54 for no compression,
55 .B packbits
56 for PackBits compression,
57 .B lzw
58 for Lempel-Ziv & Welch compression,
59 and
60 .B zip
61 for Deflate compression.
62 By default
63 .I tiffmedian
64 will compress data according to the value of the
65 .I Compression
66 tag found in the source file.
67 .IP
68 .SM LZW
69 compression can be specified together with a
70 .I predictor
71 value.
72 A predictor value of 2 causes
73 each scanline of the output image to undergo horizontal
74 differencing before it is encoded; a value
75 of 1 forces each scanline to be encoded without differencing.
76 LZW-specific options are specified by appending a ``:''-separated
77 list to the ``lzw'' option; e.g.
78 .B "\-c lzw:2"
79 for
80 .SM LZW
81 compression with horizontal differencing.
82 .TP
83 .B \-C
84 Specify the number of entries to use in the generated colormap.
85 By default all 256 entries/colors are used.
86 .TP
87 .B \-f
88 Apply Floyd-Steinberg dithering before selecting a colormap entry.
89 .TP
90 .B \-r
91 Specify the number of rows (scanlines) in each strip of data
92 written to the output file.
93 By default,
94 .I tiffmedian
95 attempts to set the rows/strip
96 that no more than 8 kilobytes of data appear in a strip.
97 .SH NOTES
98 This program is derived from Paul Heckbert's
99 .I median
100 program.
101 .SH "SEE ALSO"
102 .BR pal2rgb (1),
103 .BR tiffinfo (1),
104 .BR tiffcp (1),
105 .BR tiffcmp (1),
106 .BR libtiff (3TIFF)
107 .PP
108 .BR "Color Image Quantization for Frame Buffer Display",
109 Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.
110 .PP
111 Libtiff library home page:
112 .BR http://www.remotesensing.org/libtiff/