freeswitch/libs/tiff-4.0.2/man/tiff2bw.1

.\"	$Id: tiff2bw.1,v 1.3 2006-04-20 12:17:19 dron Exp $
.\"
.\" Copyright (c) 1988-1997 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
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.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
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.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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.\"
.if n .po 0
.TH TIFF2BW 1 "November 2, 2005" "libtiff"
.SH NAME
tiff2bw \- convert a color
.SM TIFF
image to greyscale
.SH SYNOPSIS
.B tiff2bw
[
.I options
]
.I input.tif
.I output.tif
.SH DESCRIPTION
.I Tiff2bw
converts an
.SM RGB
or Palette color
.SM TIFF
image to a greyscale image by
combining percentages of the red, green, and blue channels.
By default, output samples are created by taking
28% of the red channel, 59% of the green channel, and 11% of
the blue channel.
To alter these percentages, the
.BR \-R ,
.BR \-G ,
and
.BR \-B
options may be used.
.SH OPTIONS
.TP
.B \-c
Specify a compression scheme to use when writing image data:
.B "\-c none"
for no compression,
.B "\-c packbits"
for the PackBits compression algorithm,
.B "\-c zip
for the Deflate compression algorithm,
.B "\-c g3
for the CCITT Group 3 compression algorithm,
.B "\-c g4
for the CCITT Group 4 compression algorithm,
and
.B "\-c lzw"
for Lempel-Ziv & Welch (the default).
.TP
.B \-r
Write data with a specified number of rows per strip;
by default the number of rows/strip is selected so that each strip
is approximately 8 kilobytes.
.TP
.B \-R
Specify the percentage of the red channel to use (default 28).
.TP
.B \-G
Specify the percentage of the green channel to use (default 59).
.TP
.B \-B
Specify the percentage of the blue channel to use (default 11).
.SH "SEE ALSO"
.BR pal2rgb (1),
.BR tiffinfo (1),
.BR tiffcp (1),
.BR tiffmedian (1),
.BR libtiff (3)
.PP
Libtiff library home page:
.BR http://www.remotesensing.org/libtiff/