character in front of green screen?
Posted 24 October 2007 - 11:04 PM
Posted 24 October 2007 - 11:49 PM
Regarding how bright to make the backlight: light it the way you want it to look in the final comp, 'cuz that's how it's gonna look in the final comp. If you don't want a backlight on your subject in the final composited image, don't use one when shooting the foreground plate (greenscreen shot). Over-lighting your subject for the purpose of pulling a clean matte is going to make your comp have more of that "fake green screen look" than if you hadn't done anything in the first place!
Edit: when using minusgreen gel start with the lightest grades and increase density until reaching the desired effect. If the magenta color is visible on your subject when shooting, it will look that way in your comp as well.
Posted 25 October 2007 - 02:53 PM
It's probably less necessary if you're shooting HD or a slower film stock since your image is probably already sharp enough to not give you any problems when you do your composite later.
Posted 25 October 2007 - 03:13 PM
Posted 25 October 2007 - 04:02 PM
I am lighting a puppet style character in front of a green screen. I heard from somebody that I needed a special gel to back-light the character to avoid the fake green screen look. Is this true? If so what is the gel called? Should the strength of the back-light be a stop higher or lower then the key light/s?
I had a shoot a few months ago that was along the same lines. Lately I've become a HUGE fan of the Kino greenscreen tubes (or bluescreen)
It's a pretty simple idea really. Use a regular Kino Flo fixture to light your bluescreen, then simple use the appropriate Kino tube. The colour is super saturated. It's crazy intense. I had a shoot with both minitures (where i wanted to light to F22) and a 60' long bluescreen for some live action with a man in a monster suit (with lot's of fur)
What was amazing was that once we put the Kino's up the lighting was very even across the entire 60'. Ive never been a fan of using gels in the backlight for seperation, because I think it entirely depends on what you're trying to comp in as a background....that has to motivate what's happening with the lighting.
With the Kino's you get a very intense and narrow spectrum of colour.
Check out the rest of the stills from the shoot....I used 12x4' Quads... Those are 1watt luxeon LED's in his eyeballs by the way...;-)
Kino Tubes HERE
Posted 25 October 2007 - 04:25 PM
I used CalColor Green gels on my background lights once, and it helped a bit. But the green kinoflo tubes are relatively easy to get from a renter.