By now we've all seen what Photoshop is capable of - just look at Worth 1000 for examples of things that just can't exist, and yet do have a strange sort of life on the screen. People can be added and deleted, colours can be changed, and still scenes can be fabricated from stock images after a couple of hours of skilled effort. Editing moving footage is more difficult, though, because you've got thirty-two frames in each second to edit, times however many seconds long a particular piece of footage is. Impossible? Hardly - video editing technology is an amazing thing. I …