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Posterize in perceptual steps

In your harnessGodot shaderMIT

Reduce the image to a few flat tone levels per channel or on luminance only, quantizing after a gamma curve so steps are evenly spaced to the eye, with a hard or slightly softened step edge.

Render of Posterize in perceptual steps
The render its check recorded in Godot 4.7.2, 256 by 256 pixels.

What it takes and gives

Shader type
spatial
Render modes
unshaded, cull_disabled, depth_test_disabled, depth_draw_never, skip_vertex_transform, fog_disabled
Parameters
screen_texture (sampler2D), levels (int = 5), gamma (float = 1), luminance_only (bool = no), edge_softness (float = 0), saturation (float = 1.15)
Use it on
A MeshInstance3D with a 2 x 2 QuadMesh, material.tres as its material override and a large extra cull margin, as in demo.tscn.
Result
The scene flattened into five crisp tone steps per channel with slightly boosted saturation.
Renderers
compatibility: compiled and rendered, forward plus: not verified, mobile: not verified
Placement
res://baltor/godot_shaders/post_posterize_gamma/

Limits. Smooth gradients such as the sky turn into visible bands by design. Per-channel quantizing can shift hues in dark areas. The pass reads Godot's screen texture after opaque geometry, so transparent objects drawn after it are not processed and its order among other transparent passes is not controlled.

Details

Kind
Godot shader
Engine
Godot 4.3 or later
Files
11 files, 53.3 KB
Licence
MIT
Declared effects
reads files, runs commands
Checked with
Godot 4.7.2, opengl3 compatibility (Mesa llvmpipe, Xvfb)
Checks
contract static, engine run, engine log clean, shader in scene, capture written, render not uniform, shader changes pixels
Techniques
Gamma-biased quantization, Luminance-only posterization by rescaling
Tags
godot shader, spatial, post-process, posterize, quantize, stylized, comic, full-screen
Identity
library.supply.creative_originals.ab799cfaa9f8dc1c00c52294.0cba3b4ef8098628
Version
0cba3b4ef8098628600c8b6a06189400755428af5c27e587a765fdcf892301aa

The version is the SHA-256 of the item your harness downloads; every file in it names its own checksum.

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