title: Is there a way to identify if two images are nearly identical in Objective-C?
body: <p>Say you have two images:</p>
  
  <p><img src="https://i.stack.imgur.com/hiigg.png" alt="enter image description here"></p>
  
  <p>and </p>
  
  <p><img src="https://i.stack.imgur.com/evIQl.png" alt="enter image description here"></p>
  
  <p>These pictures are nearly identical save for a few pixels that are different colors. <strong>Is there a native way in Objective-C to identify if two pictures are nearly identical</strong>? If not, <strong>is there another way to do it</strong>?</p>