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 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.

tiff2bw - convert a color TIFF image to greyscale tiff2bw [ options ] input.tif output.tif Tiff2bw converts an RGB or Palette color 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 -R , -G , and -B options may be used.

-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).

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

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