tiff2bw(1)

TIFF2BW(1)               USER COMMANDS                 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 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),   lib-
     tiff(3)

                  Last change: October 15, 1995                 1