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Apply Chroma Key at a specific area – Final Cut
Hi,
I am trying to apply the chroma key to a specific area in my screen.
The center of the scene has a fake TV with a green screen and around it more objects with green. When I apply the Keying on the scene I loose my green from everything. I would like only to apply it at a specific area, the fake TV. Is that possible?
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12 Replies
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What you want to do is use a thing called a garbage matte. If you’re on a version before 10.2 you should duplicate the clip and apply a mask on the top layer. this would also be the layer that you use the key on. If you’re on 10.2+ you can just click the shape button in the upper right of the effect in your inspector. This will allow you to add a shape mask that will restrict the key to it’s bounds. If the shot has movement than you can animate it with keyframes. If this is a common task for you than you should consider using SliceX/TrackX/DriveX (specifically SliceX or TrackX for this task). It offers tracking capabilities that can automate the animation of your mask.
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NickZimmerman.net
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For something like a TV it’s often easier to just use a corner pin distort and forget about the green screen altogether unless something passes in front of the TV.
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I’m with Brent on this one, but also want to point out trackers exist in Apple Motion and work okay.
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The new slice x, track x, drive x bundle from core melt is amazing.
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No doubt. I can’t yet afford those, but there is *some* of the same functionality in Motion. Not all, but”some”.
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Hi Nicholas, thanks a lot for you replying. But I am still confused on how to do it. I have been trying to insert the mask, but it does not work.
I can add the mask on the “Color Correction”, but it does not let me to do it at Keying effect.
If I go to the mask effect and insert it, and insert the keyer. The keyer will still apply over the whole scene.
I have tried a lot of possibilities.
thanks!
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Is there anything that passes in front of the TV?
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Yes, hands and heads. 🙂
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Then as Nicholas mentions, crop the picture and put a full instance of the clip behind it without the key.
The top layer will look like this:
and the bottom layer will be the full image
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I have tried to do it, but there is still a problem. The green from the full image still appears when the video is not in 16:9 configuration:
Note that I have inserted the TV video between the cropped image and the full image:
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