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Glass of water in front of green screen- problems

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Dave Vizian
Glass of water in front of green screen- problems
on Sep 12, 2012 at 3:52:27 pm

I'm having trouble keeping a glass of water intact when keyed in the foreground of a green screen shot. I'm on CS5 and using Keylight as well as other simple keys. I'm getting a great key around the talent, but the glass is a real problem! It's a real case of eroding glass syndrome.

Anyone know the best way to tackle this?

Here's the shot:

http://www.takeoutdoesitall.com/glassshotlq.mov

Thanks everyone


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Angelo Lorenzo
Re: Glass of water in front of green screen- problems
on Sep 12, 2012 at 4:16:51 pm

Are you keying everything with the same settings? Or have you separated the foreground, keyed each section differently, but still feel you're not getting a good key just for the glass?

Angelo Lorenzo
Fallen Empire Digital Production Services - Los Angeles
RED transcoding, on-set DIT, and RED Epic rental services
Fallen Empire - The Blog
A blog dedicated to filmmaking, the RED workflow, and DIT tips and tricks


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Dave Vizian
Re: Glass of water in front of green screen- problems
on Sep 13, 2012 at 1:16:42 am

I pretty much keyed for the talent and it was fine until I got to parts where the glass is to the side of him. There should be a separate key for the glass?

Thanks


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Angelo Lorenzo
Re: Glass of water in front of green screen- problems
on Sep 13, 2012 at 4:02:16 pm

Totally, rarely does anything key correctly through an entire scene.

1) Duplicate the layer
2) On layer 1 create a rough, tracked, mask around your people. Key the greenscreen that's left around them
3) On layer 2, create a mask around the glass and key it separately, you'll need to be a lot more gentle with the settings.

If the subject and the glass cross at any point, you may need to do some rotoscoping, but I think anyone would be hard pressed to say you could do this with one key.

Angelo Lorenzo
Fallen Empire Digital Production Services - Los Angeles
RED transcoding, on-set DIT, and RED Epic rental services
Fallen Empire - The Blog
A blog dedicated to filmmaking, the RED workflow, and DIT tips and tricks


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