registry MOSH

Posterize · 030

capabilities open MOSH

Code-native visual signature / Color Chaos

posterize

Posterize

Quantize tone bands.

Category: Color Chaos
Parameters: 2
Registry no.: 030 / 143

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What it reads

Frame-local Reads only the current frame, which makes it the cheapest kind to stack and safe to render into a Conjure window at any size.

Parameters

param	key	range	default
Levels	`levels`	2..16	5
Bias	`bias`	0..1	0.5

Defaults as a layer

{ "effectId": "posterize", "params": { "levels": 5, "bias": 0.5 } }

GLSL fragment shader

The effect's own code. The uniforms and helpers above it — uTex, uFeedback, the depth proxy, the frame ring, depthAt(), timeAt() — are the same header every Ether-MOSH shader opens with, and are documented once on the registry rather than reprinted on all 143 pages.

void main(){ vec4 c = texture2D(uTex, vUv); // Levels unstepped, because a stepped param snaps under a dragging finger. // Bias shifts where the bands land, so one level count can posterise into // shadow detail or into highlight detail. c.rgb = floor(clamp(c.rgb + (uBias - 0.5) * 0.4, 0.0, 1.0)*uLevels)/uLevels; gl_FragColor = c; }

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Other Color Chaos effects

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