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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta name="Content-Style" content="text/css">
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<title>TIFFDITHER</title>
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TIFFDITHER
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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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tiffdither − convert a greyscale image to bilevel
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using dithering
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SYNOPSIS
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cols="2" cellspacing="0" cellpadding="0">
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tiffdither [ 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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tiffdither converts a single channel 8-bit
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greyscale image to a bilevel image using Floyd-Steinberg
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error propagation with thresholding.
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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, zip for Deflate compression,
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g3 for CCITT Group 3 (T.4) compression, and g4
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for CCITT Group 4 (T.6) compression. By default
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tiffdither will compress data according to the value
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of the Compression tag found in the source file.
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cols="2" cellspacing="0" cellpadding="0">
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The <small>CCITT</small> Group 3 and Group 4 compression
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algorithms can only be used with bilevel data.
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Group 3 compression can be specified together with
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several T.4-specific options: 1d for 1-dimensional
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encoding, 2d for 2-dimensional encoding, and
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fill to force each encoded scanline to be zero-filled
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so that the terminating EOL code lies on a byte boundary.
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Group 3-specific options are specified by appending a
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‘‘:’’-separated list to the
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‘‘g3’’ option; e.g. −c
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g3:2d:fill to get 2D-encoded data with byte-aligned EOL
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codes.
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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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−f
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Specify the bit fill order to use in writing output
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data. By default, tiffdither will create a new file
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with the same fill order as the original. Specifying
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−f lsb2msb will force data to be written with
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the FillOrder tag set to <small>LSB2MSB ,</small>
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while −f msb2lsb will force data to be written
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with the Fill- Order tag set to <small>MSB2LSB
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.</small>
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−t
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Set the threshold value for dithering. By default the
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threshold value is 128.
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NOTES
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cols="2" cellspacing="0" cellpadding="0">
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The dither algorithm is taken from the
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tiffmedian(1) program (written by Paul Heckbert).
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SEE ALSO
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cols="2" cellspacing="0" cellpadding="0">
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pal2rgb(1), fax2tiff(1),
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tiffinfo(1), tiffcp(1), tiff2bw(1),
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libtiff(3TIFF)
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Libtiff library home page:
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http://www.remotesensing.org/libtiff/
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</body>
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</html>
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