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  • What format are screenshots in? Commented Sep 19, 2015 at 20:19
  • @MatthewRock .png Commented Sep 19, 2015 at 20:19
  • Why do you need these? I'm afraid it's not that tirvial. Commented Sep 19, 2015 at 21:07
  • So the sub-image you want can change position? It's not always at the same coordinates within the image? You should look into image processing software. I very much doubt this is something you'll be able to do with a single commandline. Commented Sep 19, 2015 at 22:19
  • I'm not aware of any standard program that does this out of the box, however the OpenCV library provides a matchTemplate correlation-based object detector. There's a C++ demo but you should also be able to use the Python API. If scaling or rotation are required, then it's less straightforward. Commented Sep 19, 2015 at 22:19