[wxWidgets.git] / src / tiff / man / tiffmedian.1

.\"
.\" Copyright (c) 1990-1997 Sam Leffler
.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
.\"
.\" Permission to use, copy, modify, distribute, and sell this software and 
.\" its documentation for any purpose is hereby granted without fee, provided
.\" that (i) the above copyright notices and this permission notice appear in
.\" all copies of the software and related documentation, and (ii) the names of
.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
.\" publicity relating to the software without the specific, prior written
.\" permission of Sam Leffler and Silicon Graphics.
.\" 
.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
.\" 
.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
.\" OF THIS SOFTWARE.
.\"
.if n .po 0
.TH TIFFMEDIAN 1 "November 2, 2005" "libtiff"
.SH NAME
tiffmedian \- apply the median cut algorithm to data in a
.SM TIFF
file
.SH SYNOPSIS
.B tiffmedian
[
.I options
]
.I input.tif
.I output.tif
.SH DESCRIPTION
.I tiffmedian
applies the median cut algorithm to an
.SM RGB
image in
.I input.tif
to generate a palette image that is written to
.IR output.tif .
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.
.SH OPTIONS
.TP
.B \-c
Specify the compression to use for data written to the output file:
.B none 
for no compression,
.B packbits
for PackBits compression,
.B lzw
for Lempel-Ziv & Welch compression,
and
.B zip
for Deflate compression.
By default
.I tiffmedian
will compress data according to the value of the
.I Compression
tag found in the source file.
.IP
.SM LZW
compression can be specified together with a 
.I predictor
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 ``:''-separated
list to the ``lzw'' option; e.g.
.B "\-c lzw:2"
for
.SM LZW
compression with horizontal differencing.
.TP
.B \-C
Specify the number of entries to use in the generated colormap.
By default all 256 entries/colors are used.
.TP
.B \-f
Apply Floyd-Steinberg dithering before selecting a colormap entry.
.TP
.B \-r
Specify the number of rows (scanlines) in each strip of data
written to the output file.
By default,
.I tiffmedian
attempts to set the rows/strip
that no more than 8 kilobytes of data appear in a strip.
.SH NOTES
This program is derived from Paul Heckbert's
.I median
program.
.SH "SEE ALSO"
.BR pal2rgb (1),
.BR tiffinfo (1),
.BR tiffcp (1),
.BR tiffcmp (1),
.BR libtiff (3TIFF)
.PP
.BR "Color Image Quantization for Frame Buffer Display",
Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.
.PP
Libtiff library home page:
.BR http://www.remotesensing.org/libtiff/
Commit	Line	Data
8414a40c VZ	1	.\"
	2	.\" Copyright (c) 1990-1997 Sam Leffler
	3	.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
	4	.\"
	5	.\" Permission to use, copy, modify, distribute, and sell this software and
	6	.\" its documentation for any purpose is hereby granted without fee, provided
	7	.\" that (i) the above copyright notices and this permission notice appear in
	8	.\" all copies of the software and related documentation, and (ii) the names of
	9	.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
	10	.\" publicity relating to the software without the specific, prior written
	11	.\" permission of Sam Leffler and Silicon Graphics.
	12	.\"
	13	.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	14	.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	15	.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	16	.\"
	17	.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	18	.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	19	.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	20	.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	21	.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	22	.\" OF THIS SOFTWARE.
	23	.\"
	24	.if n .po 0
	25	.TH TIFFMEDIAN 1 "November 2, 2005" "libtiff"
	26	.SH NAME
	27	tiffmedian \- apply the median cut algorithm to data in a
	28	.SM TIFF
	29	file
	30	.SH SYNOPSIS
	31	.B tiffmedian
	32	[
	33	.I options
	34	]
	35	.I input.tif
	36	.I output.tif
	37	.SH DESCRIPTION
	38	.I tiffmedian
	39	applies the median cut algorithm to an
	40	.SM RGB
	41	image in
	42	.I input.tif
	43	to generate a palette image that is written to
	44	.IR output.tif .
	45	The generated colormap has, by default, 256 entries.
	46	The image data is quantized by mapping each
	47	pixel to the closest color values in the colormap.
	48	.SH OPTIONS
	49	.TP
	50	.B \-c
	51	Specify the compression to use for data written to the output file:
	52	.B none
	53	for no compression,
	54	.B packbits
	55	for PackBits compression,
	56	.B lzw
	57	for Lempel-Ziv & Welch compression,
	58	and
	59	.B zip
	60	for Deflate compression.
	61	By default
	62	.I tiffmedian
	63	will compress data according to the value of the
	64	.I Compression
65	tag found in the source file.
66	.IP
67	.SM LZW
68	compression can be specified together with a
69	.I predictor
70	value.
71	A predictor value of 2 causes
72	each scanline of the output image to undergo horizontal
73	differencing before it is encoded; a value
74	of 1 forces each scanline to be encoded without differencing.
75	LZW-specific options are specified by appending a ``:''-separated
76	list to the ``lzw'' option; e.g.
77	.B "\-c lzw:2"
78	for
79	.SM LZW
80	compression with horizontal differencing.
81	.TP
82	.B \-C
83	Specify the number of entries to use in the generated colormap.
84	By default all 256 entries/colors are used.
85	.TP
86	.B \-f
87	Apply Floyd-Steinberg dithering before selecting a colormap entry.
88	.TP
89	.B \-r
90	Specify the number of rows (scanlines) in each strip of data
91	written to the output file.
92	By default,
93	.I tiffmedian
94	attempts to set the rows/strip
95	that no more than 8 kilobytes of data appear in a strip.
96	.SH NOTES
97	This program is derived from Paul Heckbert's
98	.I median
99	program.
100	.SH "SEE ALSO"
101	.BR pal2rgb (1),
102	.BR tiffinfo (1),
103	.BR tiffcp (1),
104	.BR tiffcmp (1),
105	.BR libtiff (3TIFF)
106	.PP
107	.BR "Color Image Quantization for Frame Buffer Display",
108	Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.
109	.PP
110	Libtiff library home page:
111	.BR http://www.remotesensing.org/libtiff/