cyrus@hi.UUCP (11/29/87)
Currently I have at my disposal the following 8 bit deep b/w dither routines:
1) Perform dithering using ordered (matrix) technique,
optimized for 45 degree main axis. Output is an
X bitmap.
The matrix used is:
unsigned char t[8][8] = { 52, 44, 36, 124, 132, 140, 148, 156,
60, 4, 28, 116, 220, 228, 236, 164,
68, 12, 20, 108, 212, 252, 244, 172,
76, 84, 92, 100, 204, 196, 188, 180,
132, 140, 148, 156, 52, 44, 36, 124,
200, 228, 236, 164, 60, 4, 28, 116,
212, 252, 244, 172, 68, 12, 20, 108,
204, 196, 188, 180, 76, 84, 92, 100 };
2) Perform dithering using ordered (matrix) technique.
Ref. Bayer. Output is in the form of an X bitmap.
The matrix used is:
/* Dither matrix, four-point star type */
unsigned char t1[5][5] = { 40, 80, 140, 120, 20,
60, 170, 210, 190, 100,
150, 240, 250, 230, 160,
90, 200, 220, 180, 50,
10, 110, 130, 70, 30 };
/* Dither matrix, box type */
unsigned char t2[5][5] = { 138, 230, 5, 219, 107,
87, 46, 179, 67, 148,
189, 26, 250, 15, 199,
158, 77, 168, 56, 97,
128, 209, 36, 240, 117 };
3) Dithering by error diffusion. Error is diffused modulo 256
to the pixel to the right and to the three pixels below.
My question is: "Does anyone have anyother dithering algorithims,
other than the ones mentioned above, that they use and are in the
public domain?"
I have seen some SUN background that use some 'rather interesting'
dithers. For example "yosemite", "shakespeare", "porsche" plus
man others.
I would very much like to get ahold of some dithers.
Thanks in advance
--
@__________@ W. Tait Cyrus (505) 277-0806
/| /| University of New Mexico
/ | / | Dept of EECE - Hypercube Project
@__|_______@ | Albuquerque, New Mexico 87131
| | | |
| | hc | | e-mail:
| @.......|..@ cyrus@hc.dspo.gov or
| / | / seismo!unmvax!hi!cyrus
@/_________@/webber@brandx.rutgers.edu.UUCP (11/30/87)
In article <20906@hi.UUCP>, cyrus@hi.UUCP (Tait Cyrus) writes: > Currently I have at my disposal the following 8 bit deep b/w dither routines: > ... > My question is: "Does anyone have anyother dithering algorithims, > other than the ones mentioned above, that they use and are in the > public domain?" The book: Digital Halftoning by Robert Ulichney MIT Press, 1987 (362 pages) ISBN 0-262-21009-6 is full of dithering algorithms, matrices, sample output, and discussion. Enjoy. ------ BOB (webber@athos.rutgers.edu ; rutgers!athos.rutgers.edu!webber)