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TIFFMEDIAN(1)		    General Commands Manual		 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 in-
       put.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 De-
	      flate compression.  By default tiffmedian	will compress data ac-
	      cording  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  en-
	      coded;  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 en-
	      try.

       -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.simplesystems.org/libtiff/

libtiff			       November	2, 2005			 TIFFMEDIAN(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | SEE ALSO

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