ShaderBattle

Easy Filters

Grayscale filter

Show the scene() test picture in black and white using luminance (not a plain average).

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The target picture for the shader challenge "Grayscale filter"
Recreate this picture. You pass at a 99% match, then try to write it in fewer characters than the par.

How this challenge works

You write a fragment shader that draws the picture above, live in your browser. A match bar shows how close you are, and the score combines accuracy, code size (the par is 690 characters in Unity (Built-in)) and GPU speed. Work in HLSL, GLSL, WGSL, Metal or Godot and export the result when you are done.

The numbers you need

Luminance
dot(color, float3(0.299, 0.587, 0.114))
Input
scene(uv) from the Toolbox

Helper functions provided

The toolbox has: scene(). Add them above your frag function with one click.

Solve it in your language

Unity (Built-in), Unity (URP), Unreal, Shadertoy / WebGL, OpenGL (LWJGL, raylib), three.js, GameMaker, LÖVE (Lua), Godot, Apple (iOS, macOS), WebGPU / Bevy.

Start coding

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