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
- 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),
(3)
Libtiff library home page: