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Sphere dithered with Blue NoiseThe same sphere before ditheringSourceDithered

13Ordered

Blue Noise

Uses a blue-noise matrix for balanced error distribution. Avoids visible patterns, producing a natural look.

Author
Robert Ulichney
Year
1993
Complexity
high
Processing cost
4 / 5
Use Blue Noise in the editorAll algorithms

How it works

Each pixel is compared with a threshold matrix tiled across the image. Fast, parallel and deliberately textured.

Threshold ranks, top-left 8×8 of 64×64
239136321662631291232726652138
2676139840212954188338463477831
31612019344210956996816572919
949558169227552517329820491037
235538371471478365250830814058
189433132898219690124011268234
4467461145397232418533739767
14532506200834531619318025843508
  • A 64×64 matrix of 4096 ranks is tiled across the image; a pixel turns white when its brightness exceeds the threshold at its position.
  • That gives 4097 distinct gray levels, each reproduced by a fixed dot pattern.
  • Showing the top-left 8×8 corner of the full 64×64 matrix.