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Gradient map recolouring

In your harnessGodot shaderMIT

Recolour the scene by mapping its luminance through a gradient texture (duotone, tritone or any ramp), with contrast and offset controls and a mix with the original colours.

Render of Gradient map recolouring
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), gradient (sampler2D), contrast (float = 1.2), offset (float = 0), mix_amount (float = 1), reverse (bool = no)
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., A gradient texture for gradient (the bundled material has one).
Result
The scene recoloured into violet shadows, pink midtones and pale gold highlights.
Renderers
compatibility: compiled and rendered, forward plus: not verified, mobile: not verified
Placement
res://baltor/godot_shaders/post_gradient_map/

Limits. All hue information is discarded at full mix; objects of equal brightness become the same colour. 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, 59.7 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
Luminance to gradient lookup (gradient map), Contrast and offset before lookup
Tags
godot shader, spatial, post-process, gradient map, duotone, color grading, stylized, full-screen
Identity
library.supply.creative_originals.5e9081bd1a21401a34fae876.6d986110720bcc1d
Version
6d986110720bcc1d730420426cf3b145a431a6ef8a168bb3025b5c916c85e301

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

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