Posterize
Posterize reduces the number of tonal levels for a flat, graphic, banded look — a classic poster/print effect.
Parameters
| Parameter | Type | Range | Default | What it does |
|---|---|---|---|---|
| Levels | number | 2 to 32 | 6 | Number of distinct tonal levels remaining after the effect. Lower is more graphic/flat. |
How it works
Posterize uses a color-quantization algorithm (ELBG) rather than a naive per-channel step function, so the resulting color palette is chosen to best represent the image's actual colors at the requested level count — the look can differ slightly from a simple "round to N steps" posterize.
See also
Threshold for the extreme two-level (pure black/white) case.
Control preview
JSON structure
{
"id": "posterize",
"enabled": true,
"params": {
"levels": 6
}
}