let me tell you light sabers are a pain in the ass. You have to rotoscope, Rotoscoping means to trace around an object.
I
ts the same way they did it in the movies. That means you save your segments into a flm file format with either preimier or after effects and open it in photoshop, which will let you edit frame by frame as if you where looking at a film strip.

It takes a lot of time. BTW This is also how objects can seamlessly go in front or behind you and not look fake. you have to manually alter your video's at least to some extent.

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