pure-color/convert/lab2xyz.js

Pure functions for color conversion and parsing

function lab2xyz(lab) {
  var l = lab[0],
      a = lab[1],
      b = lab[2],
      x, y, z, y2;

  if (l <= 8) {
    y = (l * 100) / 903.3;
    y2 = (7.787 * (y / 100)) + (16 / 116);
  } else {
    y = 100 * Math.pow((l + 16) / 116, 3);
    y2 = Math.pow(y / 100, 1/3);
  }

  x = x / 95.047 <= 0.008856 ? x = (95.047 * ((a / 500) + y2 - (16 / 116))) / 7.787 : 95.047 * Math.pow((a / 500) + y2, 3);

  z = z / 108.883 <= 0.008859 ? z = (108.883 * (y2 - (b / 200) - (16 / 116))) / 7.787 : 108.883 * Math.pow(y2 - (b / 200), 3);

  return [x, y, z];
}

module.exports = lab2xyz;