@atlaskit/tokens/dist/esm/utils/rgb-to-lab.js

Design tokens are the single source of truth to name and store design decisions.

export function rgbToLab(rgb) {
  var r = rgb[0] / 255,
    g = rgb[1] / 255,
    b = rgb[2] / 255,
    x,
    y,
    z;
  r = r > 0.04045 ? Math.pow((r + 0.055) / 1.055, 2.4) : r / 12.92;
  g = g > 0.04045 ? Math.pow((g + 0.055) / 1.055, 2.4) : g / 12.92;
  b = b > 0.04045 ? Math.pow((b + 0.055) / 1.055, 2.4) : b / 12.92;
  x = (r * 0.4124 + g * 0.3576 + b * 0.1805) / 0.95047;
  y = (r * 0.2126 + g * 0.7152 + b * 0.0722) / 1.0;
  z = (r * 0.0193 + g * 0.1192 + b * 0.9505) / 1.08883;
  x = x > 0.008856 ? Math.pow(x, 1 / 3) : 7.787 * x + 16 / 116;
  y = y > 0.008856 ? Math.pow(y, 1 / 3) : 7.787 * y + 16 / 116;
  z = z > 0.008856 ? Math.pow(z, 1 / 3) : 7.787 * z + 16 / 116;
  return [116 * y - 16, 500 * (x - y), 200 * (y - z)];
}