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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<title>TIFFMEDIAN</title>
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TIFFMEDIAN
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NAME
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SYNOPSIS
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DESCRIPTION
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OPTIONS
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NOTES
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SEE ALSO
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NAME
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cols="2" cellspacing="0" cellpadding="0">
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tiffmedian − apply the median cut algorithm to data
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in a <small>TIFF</small> file
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SYNOPSIS
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cols="2" cellspacing="0" cellpadding="0">
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tiffmedian [ options ] input.tif
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output.tif
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DESCRIPTION
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cols="2" cellspacing="0" cellpadding="0">
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tiffmedian applies the median cut algorithm to an
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<small>RGB</small> image in input.tif to generate a
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palette image that is written to output.tif. The
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generated colormap has, by default, 256 entries. The image
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data is quantized by mapping each pixel to the closest color
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values in the colormap.
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OPTIONS
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cols="5" cellspacing="0" cellpadding="0">
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−c
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Specify the compression to use for data written to the
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output file: none for no compression, packbits
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for PackBits compression, lzw for Lempel-Ziv &
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Welch compression, and zip for Deflate compression.
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By default tiffmedian will compress data according to
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the value of the Compression tag found in the source
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file.
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cols="2" cellspacing="0" cellpadding="0">
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<small>LZW</small> compression can be specified together
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with a predictor value. A predictor value of 2 causes
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each scanline of the output image to undergo horizontal
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differencing before it is encoded; a value of 1 forces each
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scanline to be encoded without differencing. LZW-specific
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options are specified by appending a
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‘‘:’’-separated list to the
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‘‘lzw’’ option; e.g. −c
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lzw:2 for <small>LZW</small> compression with horizontal
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differencing.
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cols="5" cellspacing="0" cellpadding="0">
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−C
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Specify the number of entries to use in the generated
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colormap. By default all 256 entries/colors are used.
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−f
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Apply Floyd-Steinberg dithering before selecting a
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colormap entry.
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−r
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Specify the number of rows (scanlines) in each strip of
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data written to the output file. By default,
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tiffmedian attempts to set the rows/strip that no
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more than 8 kilobytes of data appear in a strip.
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NOTES
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cols="2" cellspacing="0" cellpadding="0">
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This program is derived from Paul Heckbert’s
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median program.
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SEE ALSO
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pal2rgb(1), tiffinfo(1), tiffcp(1),
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tiffcmp(1), libtiff(3TIFF)
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Color Image Quantization for Frame Buffer Display,
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Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.
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Libtiff library home page:
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http://www.simplesystems.org/libtiff/
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</body>
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</html>
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