1TIFF2BW(1) General Commands Manual TIFF2BW(1)
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6 tiff2bw - convert a color TIFF image to greyscale
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9 tiff2bw [ options ] input.tif output.tif
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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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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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37 pal2rgb(1), tiffinfo(1), tiffcp(1), tiffmedian(1), libtiff(3)
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39 Libtiff library home page: http://www.simplesystems.org/libtiff/
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43libtiff November 2, 2005 TIFF2BW(1)