tiffdither - convert a greyscale image to bilevel using dithering

tiffdither converts a single channel 8-bit greyscale image to a bilevel image using Floyd-Steinberg error
       propagation with thresholding.

       tiffdither - convert a greyscale image to bilevel using dithering

       The dither algorithm is taken from the tiffmedian(1) program (written by Paul Heckbert).

-c     Specify  the  compression  to  use  for  data written to the output file: none for no compression,
              packbits for PackBits compression, lzw  for  Lempel-Ziv  &  Welch  compression,  zip  for  Deflate
              compression,  g3  for CCITT Group 3 (T.4) compression, and g4 for CCITT Group 4 (T.6) compression.
              By default tiffdither will compress data according to the value of the Compression  tag  found  in
              the source file.

              The CCITT Group 3 and Group 4 compression algorithms can only be used with bilevel data.

              Group  3  compression  can  be  specified  together  with  several  T.4-specific  options:  1d for
              1-dimensional encoding, 2d for 2-dimensional encoding, and fill to force each encoded scanline  to
              be zero-filled so that the terminating EOL code lies on a byte boundary.  Group 3-specific options
              are specified by appending a ``:''-separated list to the ``g3'' option; e.g.  -cg3:2d:fill to get
              2D-encoded data with byte-aligned EOL codes.

              LZW  compression  can be specified together with a predictor value.  A predictor value of 2 causes
              each scanline of the output image to undergo horizontal differencing before it is encoded; a value
              of 1 forces each scanline to be encoded without differencing.  LZW-specific options are  specified
              by appending a ``:''-separated list to the ``lzw'' option; e.g.  -clzw:2 for LZW compression with
              horizontal differencing.

       -f     Specify  the  bit  fill order to use in writing output data.  By default, tiffdither will create a
              new file with the same fill order as the original.  Specifying -flsb2msb will force  data  to  be
              written  with  the  FillOrder  tag set to LSB2MSB , while -fmsb2lsb will force data to be written
              with the FillOrder tag set to MSB2LSB .

       -r     Make each strip have no more than the given number of rows.

       -t     Set the threshold value for dithering.  By default the threshold value is 128.

pal2rgb(1), fax2tiff(1), tiffinfo(1), tiffcp(1), tiff2bw(1), libtiff(3TIFF)

       Libtiff library home page: http://www.simplesystems.org/libtiff/

libtiff                                        September 20, 2005                                  TIFFDITHER(1)

tiffdither [ options ] input.tifoutput.tif