TIFF2BW(1)						      General Commands Manual							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     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 approxi-
	      mately 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: http://www.remotesensing.org/libtiff/

libtiff 							 November 2, 2005							TIFF2BW(1)