title: mac: compare two folders, extract non-identical photos only
body: <p>I have been looking in S.O. for ways to compare two folders to extract only the "new" or the "non-identical" photos. I have two large folders and I only want the new files, I need to identify them. Is there a way to do it? or an application to do it?</p>
  
  <p>situation: with the iOS8, I gave it a try, and then I revert back to iOS711. but my most recent backup (the one I did before upgrading to iOS8) was corrupt, due to the downgrade I did. 
  Now, I have a copy of my iOS photos from the recent backup (I had to use backup extractor to extract the photos from), but I also have the photos from a month old backup that I restored into my phone after I gave up on the corrupt and recent backup.</p>
  
  <p>I have now two sets of photo libraries. one with the up to date photos (which cannot be restored in the iPhone through iTunes), and one with the month old photo library (which was restored to my iPhone through iTunes easily).</p>
  
  <p>I extracted photos from both backups, and I ended up with two directories. I only need the new photos (the difference between the two folders). </p>
  
  <p>I hope it's now clearer, and more detailed. </p>
  
  <p>Thanks a lot!</p>