red & green/blue screen

[ramdop]

hi

i am about to shoot commercial all on green screen with super techno crane

which way is batter GREEN OR BLUE?

i know this cam has problem with blue channel

so green is batter?

need any tip you can give ?

white balance?

expsure?

view?

post?


thanks

ram

 

[Dylan Macleod CSC]

Use the search tool - or Google. This has been discussed many times.

If lighting tungsten, try to avoid blue screen.

 

[ramdop]

thanks

i try to do a search but didn't get the results i was looking for

will try again

 

[k.wasley]

I've shot on green screen without problems using tungsten lights. As long as you expose the green screen properly you will be fine. I set my light meter to 250. If you can afford HMI lighting which i presume you can given it's a commercial then that is the best way to go since the RED is a native daylight 5600K sensor. This will mean there is no chance of noise in the blue channel, but tungsten lighting has been fine for me so far.

 

[Dan Hudgins]

Bayer filter

Bayer filter

Because of the way REDCODE encodes the Bayer filter data, and in general the way Bayer filter data is processed for the de-mosaic, you may get more resolution at a higher MTF in the green than in red or blue. Also lenses may resolve better in green than blue by the focus marks because most lenses are marked for visual focus, which is in the greenish part of the spectrum.

You can use an IR filter on the camera, and green gels on the lights to increase the saturation of the green background. You should not have the subject too close to the background since you do not want green light on the subject. Some better setups use backlight on the green background. You can also retro-reflect the green background to reduce green "spill" onto the sides of the subject.

 

[ramdop]

thanks
i have only this options:

light the green with 6k space light with 1/2 CTB and light the FG with daylight

or put 1/2 +green on the space light

and work with day light on the FG

or maybe to work with 5000k
and 1/2 CTB on FG object

 

[Dan Hudgins]

Day or Night

Day or Night

If you need to shoot outdoors you may be able to shoot at night and get better control over the FG to BG lighting ratio.

You should probably shoot some test shots before hand to see what light levels work for getting the mattes to be clean.

 

[ramdop]

it's a studio shoot