Green Screen through tinted windows?

Darkwalker

Darkwalker

Member
This is a total noob question and I'm not sure I'm posting in the right place but here goes.
I'm working on a practice project and in one scene I have an individual driving a car.
The actor is actually too young to drive so I wanted to do some green screen work to
make it appear as though she's driving. I've done a little of this before but the problem I have now is the vehicle I want to use has dark tinted windows, I'm wondering if this will be an issue when the it comes time to key out the green.
Will the tint interfere with image quality, will it even work?
I have a few other ideas if this wont work but I wouldn't get the same results as I would with some good old green sreen.
 
Can you find a double that is of age to drive to play the part on some wide shots? If so, put your shoot car on a trailer and tow it around for your closeups and any dialog. If you get a large enough trailer and can drive slow enough you can even ride along with the camera on a tripod, you wouldn't need a car mount. For your wide shots use the double.
 
Do some tests (just the car and the greenscreen behind it) but yes I suspect the tinting will make the green too non-green to use as a key.

For some closeup side shots, you may be able to simply have the windows wound down, but that won't help for wider shots unless you can do some cheating as suggested by KKeller.
 
Tints on the front windows are illegal, so they should only really be on the rear windshield and on the doors in the back. Try to frame it up so that the back windows aren't even in the shot.
 
Moseph said:
Tints on the front windows are illegal.
Click to expand...

It's state by state, based on percentage.


I think you should be fine. If I understand tinting correctly it's basically like the window has been ND'd a certain amount, but doesn't actually change the color of anything outside. Regardless, keying can be done to any color, green and blue just happen to be the most common. If the green screen is lit properly and that color doesn't show up elsewhere in the scene, you shouldn't have too much of a problem.
 
Scott Lovejoy said:
It's state by state, based on percentage.


I think you should be fine. If I understand tinting correctly it's basically like the window has been ND'd a certain amount, but doesn't actually change the color of anything outside. Regardless, keying can be done to any color, green and blue just happen to be the most common. If the green screen is lit properly and that color doesn't show up elsewhere in the scene, you shouldn't have too much of a problem.
Click to expand...

Well, depending on the camera's output, the 'green' could be so diluted that the keying is severely impacted.

I think a garbage matte on the tinted portion, and camera shot angling so that a garbage matte could be placed where the keying fails.

But even with side windows open (front windows opening were made illegal years ago...) camera angles need to be made so as to minimize any 'gosh the windows are really open tells' on the resulting composited image.

In "Star Wars V: The Empire Strikes Back", there was a brief shot of the cockpit of one of the ships that Luke is flying. In the original released version, there was a small masking problem right at the edge of the craft's window, and was 'clearly' visible... with magnifing glass and freeze frame... but even when running, and one looked for it, one could see the problem... move forward 20 years... and as part of the redigitizing rereleasing, that was cleaned up...

The reason I mention it, is I sort of think of current keying with the available 'prosumer' cameras, is at about early 80's film industry... perhaps that a bit to low in sophistication, with After Effect, and others... ok maybe late 80's early 90's...
 
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