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 (3tiff),

AUTHOR

       LibTIFF contributors

COPYRIGHT

       1988-2022, LibTIFF contributors

4.7                                               Mar 18, 2026                                        TIFF2BW(1)