Chromakey Question, is tracking required in post?

Ken1212

Well-known member
I want to do a two camera green screen studio shoot. It's for a two person interview setup. My question, if my cameras are locked in one location and camera one is on wide two shot, while camera two is on a shot of the guest, my question if I get a closeup of the host on camera one and back to a two shot would do I need to do any tracking in post when pulling my key for either cameras? Hence I am only changing composition from tight to wide but no dolling and both talent are sitting.
 
You should not need to do any tracking unless there is something I am missing about the shoot.

Just make sure you adjust the background accordingly for the tight shot to make the background look right.
 
It's not clear what you are asking. If you are doing a camera move off-screen, then no. If you are doing the moves on-screen, then you will have to track the shot in 3 dimensions. For this you will need to put tracking marks on the green screen to track the tilt, pan, and zoom factors. There are a lot of tutorials for this. Here is an example: https://www.youtube.com/watch?v=0Qhe7IO2hwY

You have to have reference marks to show how the background will move with the camera move.
 
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^ That tutorial is REALLY GOOD. I wish I had seen it a couple of years ago, it would have saved me a lot of pain XD
(checking the full course right now, I think I'm going to do the rental thing whenever I get some time for this; thanks a lot for posting that)
 
Trackers, or tracking, is needed only when there is movement in the scene, either camera movement, or subject movement, or both. Tracking isn't applicable in stationary shots. When one camera is wide (relatively to the other), and the other camera is relatively tight, and there is an angle difference between the 2 cameras, there will be no apparent jump-cuts. Only make sure that the background for each camera match each camera's angle (both the angle between the 2 cameras and the viewing angle of each camera).
 
By the way, the tutorial I posted is much more complicated than you need. You just need two markers in the shot. That will be enough since the camera is not moving.
 
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