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tiff2bw
=======
.. program:: tiff2bw
Synopsis
--------
**tiff2bw** [ *options* ] *input.tif* *output.tif*
Description
-----------
:program:`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
:option:`-R`, :option:`-G`, and :option:`-B` options may be used.
Options
-------
.. option:: -c compress
Specify a compression scheme to use when writing image data:
:command:`-c none` for no compression,
:command:`-c packbits` for the PackBits compression algorithm,
:command:`-c zip` for the Deflate compression algorithm,
:command:`-c g3` for the CCITT Group 3 compression algorithm,
:command:`-c g4` for the CCITT Group 4 compression algorithm,
:command:`-c lzw` for Lempel-Ziv & Welch (the default).
.. option:: -r striprows
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.
.. option:: -R redperc
Specify the percentage of the red channel to use (default 28).
.. option:: -G greenperc
Specify the percentage of the green channel to use (default 59).
.. option:: -B blueperc
Specify the percentage of the blue channel to use (default 11).
See also
--------
:doc:`pal2rgb` (1),
:doc:`tiffinfo` (1),
:doc:`tiffcp` (1),
:doc:`tiffmedian` (1),
:doc:`/man/libtiff` (3tiff),
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