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), libtiff(3)

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