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tiffmedian(1)				  User Commands 			    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 colormap.

OPTIONS
       The following options are supported:

       -c	       Specify a compression scheme to use when writing image data:

		       -c lzw		       Lempel-Ziv and Welch algorithm.

		       -c none		       No compression.

		       -c packbits	       PackBits compression algorithm.

		       -c zip		       Deflate compression algorithm.

		       If no compression-related option is specified, the input-file  compression
		       algorithm is used.

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

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

       -r	       Write data with a specified number of rows per strip. By default, the num-
		       ber  of	rows  per strip is selected so that each strip is approximately 8
		       kilobytes.

OPERANDS
       The following operands are supported:

       input.tif       The name of the input TIFF file.

       output.tif      The name of the output file.

EXTENDED DESCRIPTION
       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 being
       encoded. A predictor value of 1 forces each scanline to be encoded without differencing.

       LZW-specific options are specified by appending a colon-separated list to the lzw  option.
       For example, specify -c lzw:2 for LZW compression with horizontal differencing.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWTiff			   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Uncommitted		   |
       +-----------------------------+-----------------------------+

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

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

NOTES
       Updated by Breda McColgan, Sun Microsystems Inc., 2004.

SunOS 5.11				   26 Mar 2004				    tiffmedian(1)
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