TIFF2BW(1)                                           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  pack-
              bits  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)



                        October 15, 1995             TIFF2BW(1)
