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/**
 * @preserve
 * Copyright 2015-2018 Igor Bezkrovnyi
 * All rights reserved. (MIT Licensed)
 *
 * lab2xyz.ts - part of Image Quantization Library
 */
const refX = 0.95047; // ref_X =  95.047   Observer= 2°, Illuminant = D65
const refY = 1.0; // ref_Y = 100.000
const refZ = 1.08883; // ref_Z = 108.883

function pivot(n: number) {
  return n > 0.206893034 ? n ** 3 : (n - 16 / 116) / 7.787;
}

export function lab2xyz(L: number, a: number, b: number) {
  const y = (L + 16) / 116;
  const x = a / 500 + y;
  const z = y - b / 200;

  return {
    x: refX * pivot(x),
    y: refY * pivot(y),
    z: refZ * pivot(z),
  };
}