code: function compare(color1, color2, method) {
    var methodName = method || 'CIE76Difference';
  
    if (undefined === methods[methodName]) {
      throw new Error('Method "' + methodName + '" is unknown. See implemented methods in ./lib/method directory.');
    }
  
    /** @type Abstract */
    var methodObj = new methods[methodName];
  
    return methodObj.compare(new HexRgb(color1), new HexRgb(color2));
  }
docs: Compares two colors and returns difference from 1 to 100
  
  @param {String} color1
  @param {String} color2
  @param {String} method Default method is best from currently implemented
  @return {Number} difference