1TIFF2BW(1)                  General Commands Manual                 TIFF2BW(1)
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NAME

6       tiff2bw - convert a color TIFF image to greyscale
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SYNOPSIS

9       tiff2bw [ options ] input.tif output.tif
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DESCRIPTION

12       Tiff2bw  converts  an  RGB  or  Palette color TIFF image to a greyscale
13       image by combining percentages of the red, green,  and  blue  channels.
14       By  default,  output samples are created by taking 28% of the red chan‐
15       nel, 59% of the green channel, and 11% of the blue channel.   To  alter
16       these percentages, the -R, -G, and -B options may be used.
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OPTIONS

19       -c     Specify  a compression scheme to use when writing image data: -c
20              none for no compression, -c packbits for the  PackBits  compres‐
21              sion algorithm, -c zip for the Deflate compression algorithm, -c
22              g3 for the CCITT Group 3 compression algorithm, -c  g4  for  the
23              CCITT Group 4 compression algorithm, and -c lzw for Lempel-Ziv &
24              Welch (the default).
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26       -r     Write data with a specified number of rows per strip; by default
27              the  number  of  rows/strip  is  selected  so that each strip is
28              approximately 8 kilobytes.
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30       -R     Specify the percentage of the red channel to use (default 28).
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32       -G     Specify the percentage of the green channel to use (default 59).
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34       -B     Specify the percentage of the blue channel to use (default 11).
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SEE ALSO

37       pal2rgb(1), tiffinfo(1), tiffcp(1), tiffmedian(1), libtiff(3)
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39       Libtiff library home page: http://www.remotesensing.org/libtiff/
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43libtiff                        November 2, 2005                     TIFF2BW(1)
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