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- /*
- ** dithers.h
- **
- ** Here are some dithering matrices. They are all taken from "Digital
- ** Halftoning" by Robert Ulichney, MIT Press, ISBN 0-262-21009-6.
- */
-
- /*
- ** Order-6 ordered dithering matrix. Note that smaller ordered dithers
- ** have no advantage over larger ones, so use dither8 instead.
- */
- static int dither6[8][8] = {
- 1, 59, 15, 55, 2, 56, 12, 52,
- 33, 17, 47, 31, 34, 18, 44, 28,
- 9, 49, 5, 63, 10, 50, 6, 60,
- 41, 25, 37, 21, 42, 26, 38, 22,
- 3, 57, 13, 53, 0, 58, 14, 54,
- 35, 19, 45, 29, 32, 16, 46, 30,
- 11, 51, 7, 61, 8, 48, 4, 62,
- 43, 27, 39, 23, 40, 24, 36, 20 };
-
- /* Order-8 ordered dithering matrix. */
- static int dither8[16][16] = {
- 1,235, 59,219, 15,231, 55,215, 2,232, 56,216, 12,228, 52,212,
- 129, 65,187,123,143, 79,183,119,130, 66,184,120,140, 76,180,116,
- 33,193, 17,251, 47,207, 31,247, 34,194, 18,248, 44,204, 28,244,
- 161, 97,145, 81,175,111,159, 95,162, 98,146, 82,172,108,156, 92,
- 9,225, 49,209, 5,239, 63,223, 10,226, 50,210, 6,236, 60,220,
- 137, 73,177,113,133, 69,191,127,138, 74,178,114,134, 70,188,124,
- 41,201, 25,241, 37,197, 21,255, 42,202, 26,242, 38,198, 22,252,
- 169,105,153, 89,165,101,149, 85,170,106,154, 90,166,102,150, 86,
- 3,233, 57,217, 13,229, 53,213, 0,234, 58,218, 14,230, 54,214,
- 131, 67,185,121,141, 77,181,117,128, 64,186,122,142, 78,182,118,
- 35,195, 19,249, 45,205, 29,245, 32,192, 16,250, 46,206, 30,246,
- 163, 99,147, 83,173,109,157, 93,160, 96,144, 80,174,110,158, 94,
- 11,227, 51,211, 7,237, 61,221, 8,224, 48,208, 4,238, 62,222,
- 139, 75,179,115,135, 71,189,125,136, 72,176,112,132, 68,190,126,
- 43,203, 27,243, 39,199, 23,253, 40,200, 24,240, 36,196, 20,254,
- 171,107,155, 91,167,103,151, 87,168,104,152, 88,164,100,148, 84 };
-
- /* Order-3 clustered dithering matrix. */
- static int cluster3[6][6] = {
- 9,11,10, 8, 6, 7,
- 12,17,16, 5, 0, 1,
- 13,14,15, 4, 3, 2,
- 8, 6, 7, 9,11,10,
- 5, 0, 1,12,17,16,
- 4, 3, 2,13,14,15 };
-
- /* Order-4 clustered dithering matrix. */
- static int cluster4[8][8] = {
- 18,20,19,16,13,11,12,15,
- 27,28,29,22, 4, 3, 2, 9,
- 26,31,30,21, 5, 0, 1,10,
- 23,25,24,17, 8, 6, 7,14,
- 13,11,12,15,18,20,19,16,
- 4, 3, 2, 9,27,28,29,22,
- 5, 0, 1,10,26,31,30,21,
- 8, 6, 7,14,23,25,24,17 };
-
- /* Order-8 clustered dithering matrix. */
- static int cluster8[16][16] = {
- 64, 69, 77, 87, 86, 76, 68, 67, 63, 58, 50, 40, 41, 51, 59, 60,
- 70, 94,100,109,108, 99, 93, 75, 57, 33, 27, 18, 19, 28, 34, 52,
- 78,101,114,116,115,112, 98, 83, 49, 26, 13, 11, 12, 15, 29, 44,
- 88,110,123,124,125,118,107, 85, 39, 17, 4, 3, 2, 9, 20, 42,
- 89,111,122,127,126,117,106, 84, 38, 16, 5, 0, 1, 10, 21, 43,
- 79,102,119,121,120,113, 97, 82, 48, 25, 8, 6, 7, 14, 30, 45,
- 71, 95,103,104,105, 96, 92, 74, 56, 32, 24, 23, 22, 31, 35, 53,
- 65, 72, 80, 90, 91, 81, 73, 66, 62, 55, 47, 37, 36, 46, 54, 61,
- 63, 58, 50, 40, 41, 51, 59, 60, 64, 69, 77, 87, 86, 76, 68, 67,
- 57, 33, 27, 18, 19, 28, 34, 52, 70, 94,100,109,108, 99, 93, 75,
- 49, 26, 13, 11, 12, 15, 29, 44, 78,101,114,116,115,112, 98, 83,
- 39, 17, 4, 3, 2, 9, 20, 42, 88,110,123,124,125,118,107, 85,
- 38, 16, 5, 0, 1, 10, 21, 43, 89,111,122,127,126,117,106, 84,
- 48, 25, 8, 6, 7, 14, 30, 45, 79,102,119,121,120,113, 97, 82,
- 56, 32, 24, 23, 22, 31, 35, 53, 71, 95,103,104,105, 96, 92, 74,
- 62, 55, 47, 37, 36, 46, 54, 61, 65, 72, 80, 90, 91, 81, 73, 66 };
-