Daylight-balanced lights for Green-Screen, Tungsten for Subjects

[Mohammed Almedfa]

Hey everyone,

Just wanted to ask if there's anything to watch out for // if it's a bad idea shooting tungsten-balanced subjects with a daylight balanced greenscreen. Assuming that the footage will ultimately be rated around Tungsten color-temp and the green-screen will be keyed out with a resultant blue-ish hue. These aren't always screens on their own, but also green-screen set-extensions.

Should work alright? Bad idea? Anyone done it before? Would prefer to LED units for lighting our screens, while the lighting requirements for the rest of certain scenes can more practically be achieved in tungsten. If it seems like a poor idea, of course filtering & adjustments can be made.

Any thoughts?

Thanks a lot,
Medfa

 

[Keith_D]

The best solution is to use Kino with green spectrum tubes to light your green screen. This will give your image sensor a pure green value and make keying much easier. You may need to set up separation light with minus green gels to remove any green spill on your talent. Then use either daylight or tungsten balanced lights for your talent (red cameras prefer daylight.)
If this is not a viable solution, use daylight balanced lights for the green screen. The daylight balanced lights will preserve more the green spectrum coming from your screen than the tungsten lights will.
It is important that the green screen is evenly lit and is equal to or one stop below the key.

 

[Daniel Stilling]

I have done a ton of green screen work. The best results, with best keys, I got by doing the whole thing in daylight. And rate the camera at 320 iso. Let as much light in there as possible.

 

[Mohammed Almedfa]

Yup thanks to the both of you! Previously we've also gone for a 320ISO, 5600K set-up in general and it has worked great. In truth the one circumstance where we wanted to go for tungsten for the talent/set lights & daylight on the green-screens, turns out the light levels will work better using HMI & gelling the 19 degree Source 4 we wanted to use for a precise area of the set to daylight, so won't need to do that anymore, but I think I may just shoot a test with the tungsten/daylight set-up for future reference just to see how it turns out!

 

[ericyoung]

Please do share the results of the test if you do one! :smile:

 

[Blair S. Paulsen]

I'd watch out for tungsten spill on the GS, it could cause an irregular pattern of hue shifts that might confuse the HSL qualifier for the key.

Cheers - #19

 

[Mohammed Almedfa]

Thanks Blair, will watch out for that if we test the set up out. Will definitely share how it goes Eric!