MAN page from Fedora 11 libtiff-3.8.2-15.fc11.x86_64.rpm

TIFFMEDIAN

Section: User Commands (1)
Updated: November 2, 2005
Index

NAME

tiffmedian - apply the median cut algorithm to data in aTIFFfile

SYNOPSIS

tiffmedian[options]input.tifoutput.tif

DESCRIPTION

tiffmedianapplies the median cut algorithm to anRGBimage ininput.tifto generate a palette image that is written tooutput.tif.The generated colormap has, by default, 256 entries.The image data is quantized by mapping eachpixel to the closest color values in the colormap.

OPTIONS

-c: Specify the compression to use for data written to the output file:none for no compression,packbitsfor PackBits compression,lzwfor Lempel-Ziv & Welch compression,andzipfor Deflate compression.By defaulttiffmedianwill compress data according to the value of theCompressiontag found in the source file.
: LZWcompression can be specified together with a predictorvalue.A predictor value of 2 causeseach scanline of the output image to undergo horizontaldifferencing before it is encoded; a valueof 1 forces each scanline to be encoded without differencing.LZW-specific options are specified by appending a ``:''-separatedlist to the ``lzw'' option; e.g.-c lzw:2forLZWcompression 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 datawritten to the output file.By default,tiffmedianattempts to set the rows/stripthat no more than 8 kilobytes of data appear in a strip.

NOTES

This program is derived from Paul Heckbert'smedianprogram.

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