title: Way to auto-remove the watermark when the original watermark image is available
body: <p>I have a lot of images that I created a while back, and all of them have the same watermark in the same location. I don't have the originals. I also have the original watermark image that is applied to all pictures.</p>
  
  <p>I have never done this sort of thing before, are they any good approaches to this task?</p>