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tiff2bw(1) - phpMan tiff2bw(1) - phpMan

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TIFF2BW(1)                                                          TIFF2BW(1)

       tiff2bw - convert a color TIFF image to greyscale

       tiff2bw [ options ] input.tif output.tif

       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

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

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

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

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

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

       Libtiff library home page:

libtiff                        November 2, 2005                     TIFF2BW(1)