TIFF2BW(1)                                             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 per-
       centages, the -R, -G, and -B options may be used.

       -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

       -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).

       pal2rgb(1),   tiffinfo(1),    tiffcp(1),    tiffmedian(1),

                         October 15, 1995                       1