TIFFDITHER
Section: User Commands (1)
Updated: May 18, 1991
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NAME
tiffdither - convert a grayscale image to bilevel using dithering
SYNOPSIS
tiffdither
[
-f
] [
-4
] [
-2
] [
-o
] [
-p
] [
-t
threshold
]
file1 file2
DESCRIPTION
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
-t
option.
By default, the data in the resultant image are encoded with
LZWcompression.
If the
-f
option is specified, the data are encoded with
CCITT
Group 3 facsimile encoding.
If the
-4
option is specified, the data are encoded with
CCITT
Group 4 facsimile encoding.
The
-o,
-2,
and
-p
options are useful only when the
-f
option is used;
they reverse the default
LSB
to
MSB
bit ordering in the output file, force 2D encoding,
and force zero-padding before
EOL
codes, respectively.
NOTES
The dither algorithm is taken from the
tiffmedian(1)
program (written by Paul Heckbert).
SEE ALSO
pal2rgb(1),
fax2tiff(1),
tiffinfo(1),
tiffcp(1),
tiff2bw(1),
libtiff(3)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- NOTES
-
- SEE ALSO
-
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