vuetify/lib/util/color/transformCIELAB.js

Vue Material Component Framework

// Types

const delta = 0.20689655172413793; // 6÷29

const cielabForwardTransform = t => t > delta ** 3 ? Math.cbrt(t) : t / (3 * delta ** 2) + 4 / 29;
const cielabReverseTransform = t => t > delta ? t ** 3 : 3 * delta ** 2 * (t - 4 / 29);
export function fromXYZ(xyz) {
  const transform = cielabForwardTransform;
  const transformedY = transform(xyz[1]);
  return [116 * transformedY - 16, 500 * (transform(xyz[0] / 0.95047) - transformedY), 200 * (transformedY - transform(xyz[2] / 1.08883))];
}
export function toXYZ(lab) {
  const transform = cielabReverseTransform;
  const Ln = (lab[0] + 16) / 116;
  return [transform(Ln + lab[1] / 500) * 0.95047, transform(Ln), transform(Ln - lab[2] / 200) * 1.08883];
}
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