problem with keying out a green-screen shot

#1

hey guys :slight_smile:

i’ve recently received a shot of a man sitting on a chair and reading a newspaper, while one of the pages is covered with a green screen…

now, this shot isn’t steady… it has a pan movement. so when i keyed out the green from this shot, and put something else underneath it in my composition (a layer) , that layer hasn’t moved along with the movement of the camera. it just stayed in one place inside the composition and didn’t move with the green screen.

i hope i made myself clear… does anyone know what may cause this?

thanks!

(and if you didn’t understand what i meant, you can tell and i’ll try to be clearer :slight_smile: )

#2

Your problem is completely unrelated to the keying itself. What you need to do is to track the movement and apply that motion to the background. You can do so by using the built-in tracker or by using Mocha(which comes with AE since CS4?).

#3

and that’s always how it works when it involves green screen in motion?

so i guess i didn’t keyed a green screen shot with a movement for a long time hehe…

#4

This has nothing to do with green screen in particular(as I said before).

Whenver you composite a locked plate into a panned shot you have to to match the movement.

#5

ya, i understood…

and even if you have a “moving” plate, in order for it to match the shot, you have to track it as well… so it will fit to the camera’s movement.

#6

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