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TIFFMEDIAN(1)							 TIFFMEDIAN(1)

NAME
       tiffmedian - apply the median cut algorithm to data in a TIFF file

SYNOPSIS
       tiffmedian [ options ] input.tif output.tif

DESCRIPTION
       tiffmedian  applies  the	 median	 cut  algorithm	 to  an	 RGB  image in
       input.tif to generate a palette image that is  written  to  output.tif.
       The generated colormap has, by default, 256 entries.  The image data is
       quantized by mapping each pixel to the closest color values in the col‐
       ormap.

OPTIONS
       -c     Specify  the  compression	 to use for data written to the output
	      file: none for no compression, packbits  for  PackBits  compres‐
	      sion,  lzw  for  Lempel-Ziv  &  Welch  compression,  and zip for
	      Deflate compression.  By default tiffmedian will	compress  data
	      according	 to  the  value	 of  the  Compression tag found in the
	      source file.

	      LZW compression can  be  specified  together  with  a  predictor
	      value.   A predictor value of 2 causes each scanline of the out‐
	      put 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.  -c lzw:2 for
	      LZW compression with horizontal differencing.

       -C     Specify the number of entries to use in the generated  colormap.
	      By default all 256 entries/colors are used.

       -f     Apply  Floyd-Steinberg  dithering	 before	 selecting  a colormap
	      entry.

       -r     Specify the number of rows (scanlines) in	 each  strip  of  data
	      written  to the output file.  By default, tiffmedian attempts to
	      set the rows/strip that no more than 8 kilobytes of data	appear
	      in a strip.

NOTES
       This program is derived from Paul Heckbert's median program.

SEE ALSO
       pal2rgb(1), tiffinfo(1), tiffcp(1), tiffcmp(1), libtiff(3TIFF)

       Color  Image Quantization for Frame Buffer Display, Paul Heckbert, SIG‐
       GRAPH proceedings, 1982, pp. 297-307.

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

libtiff			       November 2, 2005			 TIFFMEDIAN(1)

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