title: How to get blurry dominant image color on like Snapguide
body: <p>I'm looking to achieve an effect like this one in Snapguide:</p>
  
  <p><img src="https://i.stack.imgur.com/85wTV.png" alt="Snapguide image colors"></p>
  
  <p>They are getting main image color and blurring (not sure, but I looks like they are) it somehow. I think I saw somewhere that there is a similar option available in iOS 8, but I couldn't find it anywhere. So does anyone know how they do it, or how can I get a similar effect?</p>
  
  <p>Also to note, I'm working on new Xcode for iOS 7 &amp; 8 in Swift, but I don't think that matters much.</p>