pure-color/convert/xyz2rgb.js

Pure functions for color conversion and parsing

function xyz2rgb(xyz) {
  var x = xyz[0] / 100,
      y = xyz[1] / 100,
      z = xyz[2] / 100,
      r, g, b;

  r = (x * 3.2406) + (y * -1.5372) + (z * -0.4986);
  g = (x * -0.9689) + (y * 1.8758) + (z * 0.0415);
  b = (x * 0.0557) + (y * -0.2040) + (z * 1.0570);

  // assume sRGB
  r = r > 0.0031308 ? ((1.055 * Math.pow(r, 1.0 / 2.4)) - 0.055)
    : r = (r * 12.92);

  g = g > 0.0031308 ? ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055)
    : g = (g * 12.92);

  b = b > 0.0031308 ? ((1.055 * Math.pow(b, 1.0 / 2.4)) - 0.055)
    : b = (b * 12.92);

  r = Math.min(Math.max(0, r), 1);
  g = Math.min(Math.max(0, g), 1);
  b = Math.min(Math.max(0, b), 1);

  return [r * 255, g * 255, b * 255];
}

module.exports = xyz2rgb;