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# Conflicts:
# tools/unsupported/CMakeLists.txt
# tools/unsupported/tif_tools-unsupported_versioninfo.rc
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tiff2bw
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=======
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.. program:: tiff2bw
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Synopsis
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--------
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**tiff2bw** [ *options* ] *input.tif* *output.tif*
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Description
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-----------
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:program:`tiff2bw` converts an RGB or Palette color TIFF
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image to a greyscale image by
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combining percentages of the red, green, and blue channels.
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By default, output samples are created by taking
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28% of the red channel, 59% of the green channel, and 11% of
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the blue channel. To alter these percentages, the
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:option:`-R`, :option:`-G`, and :option:`-B` options may be used.
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Options
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-------
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.. option:: -c compress
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Specify a compression scheme to use when writing image data:
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:command:`-c none` for no compression,
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:command:`-c packbits` for the PackBits compression algorithm,
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:command:`-c zip` for the Deflate compression algorithm,
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:command:`-c g3` for the CCITT Group 3 compression algorithm,
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:command:`-c g4` for the CCITT Group 4 compression algorithm,
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:command:`-c lzw` for Lempel-Ziv & Welch (the default).
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.. option:: -r striprows
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Write data with a specified number of rows per strip;
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by default the number of rows/strip is selected so that each strip
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is approximately 8 kilobytes.
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.. option:: -R redperc
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Specify the percentage of the red channel to use (default 28).
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.. option:: -G greenperc
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Specify the percentage of the green channel to use (default 59).
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.. option:: -B blueperc
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Specify the percentage of the blue channel to use (default 11).
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See also
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--------
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:doc:`pal2rgb` (1),
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:doc:`tiffinfo` (1),
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:doc:`tiffcp` (1),
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:doc:`tiffmedian` (1),
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:doc:`/functions/libtiff` (3tiff),
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