@kcuf/mere-color/dist/esm/util/rgb-grayscale.js

Mere color utils for generating, manipulation, a11y purposes.

export default function rgbGrayscale(rgb) {
  var r = rgb.r,
    g = rgb.g,
    b = rgb.b,
    a = rgb.a;
  var gray = r * 0.3 + g * 0.59 + b * 0.11;
  return {
    r: gray,
    g: gray,
    b: gray,
    a: a
  };
}
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