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RedHat 9 (Linux i386) - man page for tiffdither (redhat section 1)

TIFFDITHER(1)			     General Commands Manual			    TIFFDITHER(1)

       tiffdither - convert a greyscale image to bilevel using dithering

       tiffdither [ options ] input.tif output.tif

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

       -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 compres-
	      sion, 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

	      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.  -c g3:2d: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 differ-
	      encing before it is encoded; a value of 1 forces each scanline to be encoded  with-
	      out  differencing.   LZW-specific  options are specified by appending a ``:''-sepa-
	      rated list to the ``lzw'' option; e.g.  -c lzw:2 for LZW compression with  horizon-
	      tal 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  -f
	      lsb2msb will force data to be written with the FillOrder tag set to LSB2MSB , while
	      -f msb2lsb will force data to be written with the FillOrder tag set to MSB2LSB .

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

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

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

					 October 15, 1995			    TIFFDITHER(1)

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