92 lines
2.7 KiB
Groff
92 lines
2.7 KiB
Groff
.\" $Header: /cvs/maptools/cvsroot/libtiff/man/tiff2bw.1,v 1.1 1999-07-27 21:50:28 mike Exp $
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.\"
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.\" Copyright (c) 1988-1997 Sam Leffler
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.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
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.\"
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.\" Permission to use, copy, modify, distribute, and sell this software and
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.\" its documentation for any purpose is hereby granted without fee, provided
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.\" that (i) the above copyright notices and this permission notice appear in
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.\" all copies of the software and related documentation, and (ii) the names of
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.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
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.\" publicity relating to the software without the specific, prior written
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.\" permission of Sam Leffler and Silicon Graphics.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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.\" OF THIS SOFTWARE.
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.\"
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.if n .po 0
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.TH TIFF2BW 1 "October 15, 1995"
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.SH NAME
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tiff2bw \- convert a color
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.SM TIFF
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image to greyscale
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.SH SYNOPSIS
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.B tiff2bw
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[
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options
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]
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.I input.tif
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.I output.tif
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.SH DESCRIPTION
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.I Tiff2bw
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converts an
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.SM RGB
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or Palette color
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.SM TIFF
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image to a greyscale image by
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combining percentages of the red, green, and blue channels.
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By default, output samples are created by taking
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28% of the red channel, 59% of the green channel, and 11% of
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the blue channel.
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To alter these percentages, the
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.BR \-R ,
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.BR \-G ,
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and
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.BR \-B
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options may be used.
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.SH OPTIONS
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.TP
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.B \-c
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Specify a compression scheme to use when writing image data:
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.B "\-c none"
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for no compression,
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.B "-c packbits"
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for the PackBits compression algorithm,
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.B "-c zip
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for the Deflate compression algorithm,
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.B "-c g3
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for the CCITT Group 3 compression algorithm,
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.B "-c g4
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for the CCITT Group 4 compression algorithm,
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and
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.B "\-c lzw"
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for Lempel-Ziv & Welch (the default).
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.TP
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.B \-r
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Write data with a specified number of rows per strip;
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by default the number of rows/strip is selected so that each strip
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is approximately 8 kilobytes.
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.TP
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.B \-R
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Specify the percentage of the red channel to use (default 28).
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.TP
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.B \-G
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Specify the percentage of the green channel to use (default 59).
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.TP
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.B \-B
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Specify the percentage of the blue channel to use (default 11).
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.SH "SEE ALSO"
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.IR pal2rgb (1),
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.IR tiffinfo (1),
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.IR tiffcp (1),
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.IR tiffmedian (1),
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.IR libtiff (3)
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