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tiffmedian(1) [linux man page]

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  col-
       ormap.

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 number 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	     |External			   |
       +-----------------------------+-----------------------------+

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 5.10							    26 Mar 2004 						     tiffmedian(1)

Check Out this Related Man Page

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 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 compression, 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 output 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, SIGGRAPH proceedings, 1982, pp. 297-307.

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

libtiff 							 November 2, 2005						     TIFFMEDIAN(1)
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