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Apply Chroma Key at a specific area - Final Cut

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Kurt Protrek
Apply Chroma Key at a specific area - Final Cut
on Sep 26, 2015 at 3:33:08 pm

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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Nicholas Zimmerman
Re: Apply Chroma Key at a specific area - Final Cut
on Sep 26, 2015 at 4:55:02 pm

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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Bret Williams
Re: Apply Chroma Key at a specific area - Final Cut
on Sep 27, 2015 at 3:50:22 pm

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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Mark Suszko
Re: Apply Chroma Key at a specific area - Final Cut
on Sep 28, 2015 at 3:33:56 pm

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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Bret Williams
Re: Apply Chroma Key at a specific area - Final Cut
on Sep 28, 2015 at 4:09:46 pm

The new slice x, track x, drive x bundle from core melt is amazing.


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Mark Suszko
Re: Apply Chroma Key at a specific area - Final Cut
on Sep 28, 2015 at 9:15:05 pm

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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Kurt Protrek
Re: Apply Chroma Key at a specific area - Final Cut
on Oct 2, 2015 at 3:53:45 pm
Last Edited By Kurt Protrek on Oct 2, 2015 at 3:56:48 pm

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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Jeremy Garchow
Re: Apply Chroma Key at a specific area - Final Cut
on Oct 2, 2015 at 5:38:32 pm

Is there anything that passes in front of the TV?


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Kurt Protrek
Re: Apply Chroma Key at a specific area - Final Cut
on Oct 2, 2015 at 7:03:48 pm

Yes, hands and heads. :)


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Jeremy Garchow
Re: Apply Chroma Key at a specific area - Final Cut
on Oct 2, 2015 at 7:12:40 pm

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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Kurt Protrek
Re: Apply Chroma Key at a specific area - Final Cut
on Oct 2, 2015 at 7:31:53 pm

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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Jeremy Garchow
Re: Apply Chroma Key at a specific area - Final Cut
on Oct 2, 2015 at 7:44:26 pm

Then you need to composite the image on there correctly.

Crop the black bars on the fill image, and scale it up to fit the 16x9 screen.


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