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 percentages, 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 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).


   pal2rgb(1), tiffinfo(1), tiffcp(1), tiffmedian(1), libtiff(3)

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


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