Changeset 2012Tweet

Timestamp:

Nov 17, 2007, 4:02:56 PM (13 years ago)

Author:

Sam Hocevar

Message:

• Added a bunch of 8×8 matrix results.

Location:

www/study

Files:

• fig2-3-2b.png (added)
• fig2-3-2b.svg (added)
• fig2-3-3b.png (added)
• fig2-3-3b.svg (added)
• grad2-3-1b.png (added)
• grad2-3-2b.png (added)
• out2-3-1b.png (added)
• out2-3-2b.png (added)
• part2.html (modified) (2 diffs)
• study.py (modified) (2 diffs)

www/study/part2.html

@@ -124 +124 @@
 </p>
 
-<p> This 4×4 cluster dot matrix creates dot patterns that mimic the
-halftoning techniques used by newspapers: </p>
+<p> This is an 8×8 Bayer matrix, recursively created from the 4×4 version: </p>
+
+<p style="text-align: center;">
+  <img src="fig2-3-2b.png" width="240" height="240"
+       class="matrix" alt="4×4 Bayer matrix" />
+  <img src="out2-3-1b.png" width="256" height="256"
+       class="inline" alt="4×4 Bayer dithering" />
+  <img src="grad2-3-1b.png" width="32" height="256"
+       class="inline" alt="4×4 Bayer dithering gradient" />
+</p>
+
+<p> This 4×4 cluster dot matrix creates dot patterns: </p>
 
 <p style="text-align: center;">
@@ -136 +146 @@
 </p>
 
+<p> This 8×8 cluster dot matrix mimics the halftoning techniques used by
+newspapers: </p>
+
+<p style="text-align: center;">
+  <img src="fig2-3-3b.png" width="240" height="240"
+       class="matrix" alt="4×4 cluster dot matrix" />
+  <img src="out2-3-2b.png" width="256" height="256"
+       class="inline" alt="4×4 cluster dot dithering" />
+  <img src="grad2-3-2b.png" width="32" height="256"
+       class="inline" alt="4×4 cluster dot dithering gradient" />
+</p>
+
 <p> This unusual 5×3 matrix creates artistic vertical line artifacts: </p>
 

www/study/study.py

@@ -198 +198 @@
      [ 11,  3,  2,  8],
      [ 15, 10,  9, 14]]
+DITHER_CLUSTER88 = \
+    [[ 24, 10, 12, 26, 35, 47, 49, 37],
+     [  8,  0,  2, 14, 45, 59, 61, 51],
+     [ 22,  6,  4, 16, 43, 57, 63, 53],
+     [ 30, 20, 18, 28, 33, 41, 55, 39],
+     [ 34, 46, 48, 36, 25, 11, 13, 27],
+     [ 44, 58, 60, 50,  9,  1,  3, 15],
+     [ 42, 56, 62, 52, 23,  7,  5, 17],
+     [ 32, 40, 54, 38, 31, 21, 19, 29]]
 DITHER_LINE53 = \
     [[ 13,  7,  0,  4, 10],
@@ -219 +228 @@
 test23x(gradient256bw, DITHER_BAYER44).save("grad2-3-1.png")
 
+test23x(lenna256bw, DITHER_BAYER88).save("out2-3-1b.png")
+test23x(gradient256bw, DITHER_BAYER88).save("grad2-3-1b.png")
+
 test23x(lenna256bw, DITHER_CLUSTER44).save("out2-3-2.png")
 test23x(gradient256bw, DITHER_CLUSTER44).save("grad2-3-2.png")
+
+test23x(lenna256bw, DITHER_CLUSTER88).save("out2-3-2b.png")
+test23x(gradient256bw, DITHER_CLUSTER88).save("grad2-3-2b.png")
 
 test23x(lenna256bw, DITHER_LINE53).save("out2-3-3.png")