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-.\" $Id: tiffdither.1,v 1.4 2006/04/20 12:17:19 dron Exp $
-.\"
-.\" Copyright (c) 1990-1997 Sam Leffler
-.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
-.\"
-.\" Permission to use, copy, modify, distribute, and sell this software and 
-.\" its documentation for any purpose is hereby granted without fee, provided
-.\" that (i) the above copyright notices and this permission notice appear in
-.\" all copies of the software and related documentation, and (ii) the names of
-.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
-.\" publicity relating to the software without the specific, prior written
-.\" permission of Sam Leffler and Silicon Graphics.
-.\" 
-.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
-.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
-.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
-.\" 
-.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
-.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
-.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
-.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
-.\" OF THIS SOFTWARE.
-.\"
-.if n .po 0
-.TH TIFFDITHER 1 "September 20, 2005" "libtiff"
-.SH NAME
-tiffdither \- convert a greyscale image to bilevel using dithering
-.SH SYNOPSIS
-.B tiffdither
-[
-.I options
-]
-.I input.tif
-.I output.tif
-.SH DESCRIPTION
-.I tiffdither
-converts a single channel 8-bit greyscale image to a bilevel image
-using Floyd-Steinberg error propagation with thresholding.
-.SH OPTIONS
-.TP
-.B \-c
-Specify the compression to use for data written to the output file:
-.B none 
-for no compression,
-.B packbits
-for PackBits compression,
-.B lzw
-for Lempel-Ziv & Welch compression,
-.B zip
-for Deflate compression,
-.B g3
-for CCITT Group 3 (T.4) compression,
-and
-.B g4
-for CCITT Group 4 (T.6) compression.
-By default
-.I tiffdither
-will compress data according to the value of the
-.I Compression
-tag found in the source file.
-.IP
-The
-.SM CCITT
-Group 3 and Group 4 compression algorithms can only
-be used with bilevel data.
-.IP
-Group 3 compression can be specified together with several
-T.4-specific options:
-.B 1d
-for 1-dimensional encoding,
-.B 2d
-for 2-dimensional encoding,
-and
-.B fill
-to force each encoded scanline to be zero-filled so that the
-terminating EOL code lies on a byte boundary.
-Group 3-specific options are specified by appending a ``:''-separated
-list to the ``g3'' option; e.g.
-.B "\-c g3:2d:fill"
-to get 2D-encoded data with byte-aligned EOL codes.
-.IP
-.SM LZW
-compression can be specified together with a 
-.I 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.
-.B "\-c lzw:2"
-for
-.SM LZW
-compression with horizontal differencing.
-.TP
-.B \-f
-Specify the bit fill order to use in writing output data.
-By default,
-.I tiffdither
-will create a new file with the same fill order as the original.
-Specifying
-.B "\-f lsb2msb"
-will force data to be written with the
-.I Fill\%Order
-tag set to
-.SM LSB2MSB ,
-while
-.B "\-f msb2lsb"
-will force data to be written with the
-.I Fill\%Order
-tag set to
-.SM MSB2LSB .
-.TP
-.B \-t
-Set the threshold value for dithering.
-By default the threshold value is 128.
-.SH NOTES
-The dither algorithm is taken from the
-.BR tiffmedian (1)
-program (written by Paul Heckbert).
-.SH "SEE ALSO"
-.BR pal2rgb (1),
-.BR fax2tiff (1),
-.BR tiffinfo (1),
-.BR tiffcp (1),
-.BR tiff2bw (1),
-.BR libtiff (3TIFF)
-.PP
-Libtiff library home page:
-.BR http://www.remotesensing.org/libtiff/