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Kevino
Green Screen - 3- 3a few questions 8^)
on Dec 27, 2007 at 7:58:38 pm

Hi lighting pros,

Shooting full body dancing greenscreen music video scenario:

1-can I use a dimmer with totas?

I plan on lighting the screen with two Totas in Chimeras hung from a grid. Before I blow my bulbs, can anyone tell me if I can dim the totas so I can experiment with the backdrop, finding the correcct ire value.

2-I read somewhere that lighting the foreground for daylight was a good trick for increasing the contrast in the foreground subject. I'm not sure I understand this, but was hoping someone on the list might help. If I were to opt for Kinos for foreground, would I be better off with daylight balanced bulbs?

3-I read about Adobes Location software which looked ideal for Chromakey work. As I am mac based, would anyone be able to share their software tolsof choice for working in a greenscreen scenario. I will be shooting HVX-200. Hopefully I can connect the camera directly to my FCP setup and use the scopes to check the screen and foreground values.

Many thanks in advance for any illumination.

Best,


Kevin


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Dennis Size
Re: Green Screen - 3- 3a few questions 8^)
on Dec 28, 2007 at 3:28:01 am

Quesstion 1 - no
Question 2 - no


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Dennis Size
Re: Green Screen - 3- 3a few questions 8^)
on Dec 28, 2007 at 3:34:48 am

Sorry this got away from me before I was done.

QUESTION 1 - No.... unless you don't mind the color temperature shift on your greenscreen -- otherwise dim away. I always have my greenscreen sources on a dimmer (unless I'm using non-dim fluorescents).

QUESTION 2 - No ... unless you don't mind the color temperature shift between your subject and your greenscreen --which will result in more aggravation later. My choice is to color correct my subjects backlights to neutralize the green bounce back.


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Kevino
Re: Green Screen - a few questions 8^)
on Dec 28, 2007 at 8:47:10 pm

Thanks Dennis,

Thanks for posting back. I can dim the greenscreen lights. Hopefully I can get a vectorscope going and see the specific reading of all areas of the set.

So I guess we light for indoor tungsten. I didn't quite understand the logic of using daylight lighting on the subject.

Do you generally use flourecents on the screen?

Thanks again,

Kevin










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Dennis Size
Re: Green Screen - a few questions 8^)
on Dec 29, 2007 at 3:27:44 am

Fluorescents, especially IMAGE 80's, (my instrument of choice) work best when doing any Virtual Reality/Greenscreen work. If they're not available, I find any Kino Flo (usually Mega doubles) will make the job easier, cleaner, and provide a better "key".
That being said I will often use cyc lights, or even scoops. One time all I had available were PAR CANS -- which worked great when I diffused them and then stretched a silk across the area in front of them.
The point is to use a broad based, soft, even, wash of light on your greenscreen..
Once that's done it's equally important to properly light your background -- separately from your foreground (which should also be lit with fluorescent).
DS

P.S. Rather than dim your Tota's, reduce the lamp wattage to a 200w or 300w. The greenscreen will require surprising little illumination. The biggest mistake people make is overlighting the screen.


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