Masking

So this is the technique that I have determined will be best for special effects project. This is actually a combination of two techniques.

1. The first technique is to rotoscope the arm on the places that they are on the black background, then you can simply place a black solid on the from underneath and you have yourself a missing arm.

2. The second technique needs  a bit more effort. When the arm moves in front of his uniform it becomes necessary to paint each individual frame in photoshop. Since the video slows down to 59.95 frames per second it makes it quite  few frames. For this I export the exact portion that needs to be painted, then paint it in and bring in the image sequence.