https://scrawl-v8.rikweb.org.uk/demo/filters-027.html

Scrawl-canvas v8 - Filters test 027

Parameters for: reducePalette filter

To change image, drag-and-drop an image file over the canvas

Predefined palette
[black-white  ]
String of colors
[                    ]
Commonest colors
[2  ]
Min color distance
[1000                ]
Use LAB for palette distance
[false]
Random seed
[some-random-string-o]
Use bluenoise
[false]
Opacity
[1                   ]
Memoize filter
[false]

Test purpose

  * Create a test Picture entity
  * Create a reducePalette filter and apply it to the test entity
  * Update filter attributes and observe the effect they have on the
    entity

Note that this is a resource-intensive filter. Memoization is
strongly advised!

Known issue: Filter memoization will, sometimes, kill Safari-based
browsers for as-yet-unknown reasons - see demo Filters-001 for
details. For now, if Scrawl-canvas detects that the user is viewing
the canvas in a Safari-based browser, it will ignore requests to
memoize filters.

Touch test: not required

Annotated code

[iris]