title: iOS: Determine if photo in photo album is from camera
body: <p>I am trying to have my application determine if a photo in photoalbum is from camera.
  The general flow I am trying to implement is</p>
  
  <ol>
  <li>Application loads, </li>
  <li>Application enumerates Photo album </li>
  <li>If the source of the photo is Camera, then process that photo and cache its information so it can be ignored in future.</li>
  </ol>
  
  <p>Since the "Camera roll" can be written with photos from other application, I want to detect those photos that were specifically taken using the camera.</p>
  
  <p>Thanks in advance</p>