shooting glasses on green screen

[Emre Tufekci s.o.a.]

Can you fill us in about the format, camera and lights you have at your disposal. The advice might vary if you are using a DV versus a High end HD camera.

Emre
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“Creative cow is udder madness.”

[Steve Harrington]

You know it was really more a theoretical question I guess? Is it something as simple as using a camera with 4:2:2 or 4:4:4 as opposed to 4:1:1 to get a better key? I was really just wondering if the consensus of the filmmaking world is “you dont shoot green screen through wine glasses” …lol

[John Sharaf]

The better color sampling, the better the key. For that matter, the better the resolution (without artificial enhancement) the better the edge lines. That is not to say that you can’t shoot with a DV camera. As far as transparent objects, this is not an insurmountable problem either, it’s done every day, but again the better the technology you use (latest Ultimatte hardware) the better the effect.

JS

[Naren Navale]

hi interesting situation. Don’t mid just a wild suggestion….

1. why don’t you compose 3d glasses in their hands instead of
working for key….. because it is almost going to take same efforts either to compose or to remove alpha.

2.Another way is just think…..transparency feel can be achieved by reflection instead of refraction…. ( this is something tricky I m little doubtful about practical implementation)

[Jeff Greenberg]

Stay away from DV.

SD or HD (4:2:2) please.
Capture SD uncompressed.
The greater the distance the better. Even lighting. Make sure your screen brightness is the same as your foreground as well.

I’ve keyed tons of glass…might take more than one ‘pass’ at the key. I’ve done this with keylight, ultimatte, and primatte. The Key (pardon the pun) is to have it shot right and use professional keying software.

Oh yeah, test first!

Best,

Jeff G
Principal Instructor
Future Media Concepts

FMCTraining.com
Editorsretreat.com