TIFF2BW(1) LibTIFF TIFF2BW(1)
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 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).
pal2rgb (1), tiffinfo (1), tiffcp (1), tiffmedian (1), libtiff
(3tiff),
LibTIFF contributors
1988-2025, LibTIFF contributors
4.7 March 7, 2026 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
(3tiff),
AUTHOR
LibTIFF contributors
COPYRIGHT
1988-2025, LibTIFF contributors
4.7 March 7, 2026 TIFF2BW(1)