But say for example there is a shot where red light passes over the singer's face. The shot of the red light, coming out of the camera, will have black (assuming you filmed against a black background rather than green screen?) so if you overlayed this as-is, you would be overlaying the background to so what I'm wondering is how did you seperate the layers of the background and the red light so as you were only overlaying the red light?
Can you just use the black as an alpha?
Can you tell I want to try and copy some of your ideas in the future? (Feel free to keep them to yourself of course I won't mind if you say as much)
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