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Driving green screen- green reflection in glasses causing an issue.

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Levi PoundsDriving green screen- green reflection in glasses causing an issue.
by on Feb 8, 2014 at 4:52:29 pm

Hi all. Disclaimer: I am relatively new to AE and have been using tutorials to learn over the past month or so.

I have just finished locking the picture edit for a TV pilot I am editing. It is not VFX heavy (single camera style comedy) but there is one driving green screen scene. 3 angles- a head on two shot through the windshield, and a profile shot of both actors.

My issue is with the head-on shot through the windshield. I managed to get a reasonably good key using the technique in this tutorial: http://www.videocopilot.net/tutorial/advanced_soft_keying/

The problem is that the actor in the driver's seat is wearing glasses that produce a bar of green reflection which allows the background plate to show up over one of his eyes. Screen shot attached. A friend of mine suggested this could be fixed with a simple garbage matte. I'm really not sure how to execute this. Any help would be greatly appreciated.


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Roland R. KahlenbergRe: Driving green screen- green reflection in glasses causing an issue.
by on Feb 9, 2014 at 2:49:28 am

A garbage matte prior to keying will not do the job - all it'll do is prevent the green bar from being keyed. I assume that this is what you've done. Hence, the green bar on the glasses.

You have to do the following -
1) track the green bar
2) create a patch to cover the green bar
3) apply the tracking result onto the path in (2)

Good Luck
RoRK
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Darby EdelenRe: Driving green screen- green reflection in glasses causing an issue.
by on Feb 9, 2014 at 6:29:52 am

You can use a mask on the original footage to hold out the green section of the glasses. Then you can remove the green using your despill technique of choice.

Darby Edelen


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Levi PoundsRe: Driving green screen- green reflection in glasses causing an issue.
by on Feb 9, 2014 at 4:30:41 pm

Thanks for the tip.

Excuse my ignorance but when masking the original footage, do I use the pen tool to select the area I'd like to isolate? When I do this is seems make everything outside the mask black. Is this done with mutiple layers or is there a setting I should turn one.

Basically what I'm asking is how do I tell after effects "do not key this area".

Levi


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Levi PoundsRe: Driving green screen- green reflection in glasses causing an issue.
by on Feb 9, 2014 at 4:49:15 pm

So I used two layers with the mask on top. I used colour suppression on the top masked layer and that seems to have done it. There is still a reflection but it is not green.

Much better. Thanks both.


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