tiff2bw (1)

Leading comments

	$Id: tiff2bw.1,v 1.4 2016-09-25 20:05:51 bfriesen 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
 all copies of the software and related documentation, and (ii) the names of
 Sam Leffler and Silicon Graphics may not be used in ...

(The comments found at the beginning of the groff file "man1/tiff2bw.1".)

NAME

tiff2bw - convert a color image to greyscale

SYNOPSIS

tiff2bw [ options ] input.tif output.tif

DESCRIPTION

Tiff2bw converts an or Palette color 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 -R, -G, and -B options may be used.

OPTIONS

-c

Specify a compression scheme to use when writing image data: -c none for no compression, -c packbits for the PackBits compression algorithm, -c zip for the Deflate compression algorithm, -c g3 for the CCITT Group 3 compression algorithm, -c g4 for the CCITT Group 4 compression algorithm, and -c lzw for Lempel-Ziv & Welch (the default).

-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.

-R

Specify the percentage of the red channel to use (default 28).

-G

Specify the percentage of the green channel to use (default 59).

-B

Specify the percentage of the blue channel to use (default 11).

SEE ALSO

pal2rgb(1), tiffinfo(1), tiffcp(1), tiffmedian(1), libtiff(3)

Libtiff library home page: www.simplesystems.org/libtiff