All effects and presets

Effect

Kuwahara

Painterly Kuwahara smoothing that preserves edges while flattening regions.

The Kuwahara filter was introduced in 1976 by Michiyoshi Kuwahara and colleagues at Kyoto for smoothing noisy radioisotope angiocardiograms. It compares neighbouring regions and averages the one with least variance, so edges survive while flat areas calm down.

Artists later noticed that the same edge-preserving smooth reads as paint. Painterly flattening without a brush stroke simulator is the creative hook.

Kuwahara example
Example

Properties

  • Radius

    neighborhood radius in pixels

    Range
    1 to 8
    Default
    3

  • Sharpness

    prefer lower-variance sectors

    Range
    0.2 to 4
    Default
    1.2

  • Anisotropy

    elongate sectors along structure

    Range
    0 to 1
    Default
    0.65

  • Mix

    blend with original

    Range
    0 to 1
    Default
    1

Command line

Requires Rethings Pro. Install the tool from Rethings → Install Command Line Tool… 

rethings apply --effect kuwahara --set radius=3 --set sharpness=1.2 -i input.jpg -o output.png

Gallery

  • Kuwahara example 1
  • Kuwahara example 2
  • Kuwahara example 3
  • Kuwahara example 4
  • Kuwahara example 5
  • Kuwahara example 6
  • Kuwahara example 7
  • Kuwahara example 8
  • Kuwahara example 9
  • Kuwahara example 10
  • Kuwahara example 11
  • Kuwahara example 12
  • Kuwahara example 13
  • Kuwahara example 14
  • Kuwahara example 15
  • Kuwahara example 16
  • Kuwahara example 17
  • Kuwahara example 18
  • Kuwahara example 19
  • Kuwahara example 20
  • Kuwahara example 21
  • Kuwahara example 22
  • Kuwahara example 23
  • Kuwahara example 24
  • Kuwahara example 25
  • Kuwahara example 26
  • Kuwahara example 27
  • Kuwahara example 28
  • Kuwahara example 29
  • Kuwahara example 30
  • Kuwahara example 31
  • Kuwahara example 32
  • Kuwahara example 33
  • Kuwahara example 34
  • Kuwahara example 35
  • Kuwahara example 36
  • Kuwahara example 37
  • Kuwahara example 38
  • Kuwahara example 39
  • Kuwahara example 40
  • Kuwahara example 41
  • Kuwahara example 42
  • Kuwahara example 43
  • Kuwahara example 44
  • Kuwahara example 45