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tiff2bw(1)                           LibTIFF                          tiff2bw(1)




NAME

       tiff2bw - convert a color TIFF image to greyscale


SYNOPSIS

       tiff2bw [ options ] input.tif output.tif


DESCRIPTION

       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.


OPTIONS


       -c compress
              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, -c lzw for Lempel-Ziv & Welch (the
              default).

       -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.

       -R redperc
              Specify the percentage of the red channel to use (default 28).

       -G greenperc
              Specify the percentage of the green channel to use (default 59).

       -B blueperc
              Specify the percentage of the blue channel to use (default 11).


SEE ALSO

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


AUTHOR

       LibTIFF contributors


COPYRIGHT

       1988-2022, LibTIFF contributors



4.5                             December 23, 2022                     tiff2bw(1)

tiff 4.5.0 - Generated Sat Dec 24 12:44:30 CST 2022
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