     /**
      Make color darker with defined amount.
 
-     - parameter amount Defines how much darker color is returned. Should be from 0.0 to 1.0
+     - parameter amount: Defines how much darker color is returned. Should be from 0.0 to 1.0
      */
     public func darker(amount: CGFloat) -> UIColor {
         return colorWithBrightnessAmount(1 - amount)

    /**
     Make color lighter with defined amount.

     - parameter amount Defines how much lighter color is returned. Should be from 0.0 to 1.0
     */
    public func lighter(amount: CGFloat) -> UIColor {
        return colorWithBrightnessAmount(1 + amount)

    /**
     Initialize color from hex string (eg. "#ff00ff"). Leading '#' is mandatory.

     - parameter hexString: Hex string to create color from
     */
    public convenience init(hexString: String) {
        var rgbValue: UInt32 = 0
