Category : C Source Code
Archive   : FBMTIFF.ZIP
Filename : TIFFDITH.1

.\" @(#)tiffdither.1 1.6 5/15/90
.\"
.\" Copyright (c) 1988 by Sam Leffler.
.\" All rights reserved.
.\"
.\" This file is provided for unrestricted use provided that this
.\" legend is included on all tape media and as a part of the
.\" software program in whole or part. Users may copy, modify or
.\" distribute this file at will.
.\"
.TH TIFFDITHER 1 "May 2, 1989"
.SH NAME
tiffdither \- convert a grayscale image to bilevel using dithering
.SH SYNOPSIS
.B tiffdither
[
.B \-f
] [
.B \-o
] [
.B \-p
] [
.B \-t
.I threshold
]
.I "file1 file2"
.SH DESCRIPTION
.I Tiffdither
converts a single channel 8-bit grayscale image to a bilevel image
using Floyd-Steinberg error propagation with threholding.
By default the threshold value is 128; this can be changed with the
.B \-t
option.
.PP
The data in the resultant image are compressed either with
.SM LZW
or, if the
.B \-f
option is specified, with
.SM CCITT
Group 3 fax encoding.
The
.B \-o
and
.B \-p
options are useful only when the
.B \-f
option is used;
they reverse the default
.SM LSB
to
.SM MSB
bit ordering in the output file and force zero-padding
before
.SM EOL
codes, respectively.
.SH NOTES
The dither algorithm is taken from the
.IR tiffmedian (1)
program (written by Paul Heckbert).
.SH "SEE ALSO"
.IR pal2rgb (1),
.IR fax2tiff (1),
.IR tiffinfo (1),
.IR tiffcp (1),
.IR tiff2bw (1),
.IR libtiff (3)