@luma.gl/shadertools/src/modules/image-adjust-filters/vibrance.js

Shader module system for luma.gl

/** @typedef {import('../../types').ShaderPass} ShaderPass */

const fs = `\
uniform float amount;

vec4 vibrance_filterColor(vec4 color) {
  float average = (color.r + color.g + color.b) / 3.0;
  float mx = max(color.r, max(color.g, color.b));
  float amt = (mx - average) * (-amount * 3.0);
  color.rgb = mix(color.rgb, vec3(mx), amt);
  return color;
}

vec4 vibrance_filterColor(vec4 color, vec2 texSize, vec2 texCoord) {
  return vibrance_filterColor(color);
}
`;

const uniforms = {
  amount: {value: 0, min: -1, max: 1}
};

/** @type {ShaderPass} */
export const vibrance = {
  name: 'vibrance',
  uniforms,
  fs,
  passes: [{filter: true}]
};