title: Is it sufficient to supply 3x image only for all versions on iPhone?
body: <p>is it not enough to supply just 3x resolution image (e.g for a view or button)  in Xcode so that it looks good on iPhone 5,6,and 6plus devices 
  ( i.e leaving 1x and 2x in an image set blank )</p>
  
  <p>My reasoning is that  1x image may look blurry on 6 plus but 3x image should look fine on 5 </p>
  
  <p>Basically i am asking so that i can communicate the same to my graphic designer and he should be fine with supplying a singe size rather than three sizes for all images</p>