tiff2bw(1) LibTIFF tiff2bw(1)
NAME
tiff2bw - convert a color TIFF image to greyscale
SYNOPSIS
tiff2bw [ options ] input.tif output.tif
DESCRIPTION
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.
OPTIONS
-c compress
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, -c lzw for Lempel-Ziv & Welch (the
default).
-r striprows
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 redperc
Specify the percentage of the red channel to use (default 28).
-G greenperc
Specify the percentage of the green channel to use (default 59).
-B blueperc
Specify the percentage of the blue channel to use (default 11).
SEE ALSO
pal2rgb(1), tiffinfo(1), tiffcp(1), tiffmedian(1), libtiff(3),
AUTHOR
LibTIFF contributors
COPYRIGHT
1988-2022, LibTIFF contributors
4.5 December 23, 2022 tiff2bw(1)
tiff 4.5.0 - Generated Sat Dec 24 12:44:30 CST 2022