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

TIFFMEDIAN(1)			     General Commands Manual			    TIFFMEDIAN(1)

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

       tiffmedian [ options ] input.tif output.tif

       tiffmedian applys the median cut algorithm to an RGB image in input.tif to generate a pal-
       ette 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 colormap.

       -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, 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 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.

       -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.

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

       pal2rgb(1), tiffinfo(1), tiffcp(1), tiffcmp(1), libtiff(3)

       "Color  Image Quantization for Frame Buffer Display", Paul Heckbert, SIGGRAPH proceedings,
       1982, pp. 297-307.

					 October 15, 1995			    TIFFMEDIAN(1)

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