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Posted by DanR on 11/13/06 23:26
adric22@yahoo.com wrote:
> I'm trying to get some video work done in front of a green screen. I
> have been very dis-satisfied with the price of the screens I've seen
> in photography shops, so I decided to build my own. The fabric cost
> me about $5 and I built the stand and all for under $50.
>
> Here's the trouble. I can't seem to get a perfect key. Most of the
> problem seems to stem from uneven lighting on the screen. The only
> way I can light it evenly is from the front of the screen but then my
> body casts a shadow on it. I could possibly light it from the back,
> but I don't have enough room as the room I'm shooting this in is only
> 10 feet square. I'd need another 10 foot to place a bright light
> behind the screen and get even lighting. If I put the light beside
> or below the screen, then the light is at an angle and doesn't evenly
> light the screen.
>
> Another problem I'm having. My camera is an older, cheaper digital-8
> camera. It does not have a manual white-balance setting. So what
> happens is when the camera shot is totally green, the auto-white
> balance kicks in and desaturates the green. It is still green, but
> not as much as it should be. Any ideas to prevent this (short of
> buying a new camera?)
You must light the green screen separately from the subject. A couple of
lights from the side may do it. Then light the subject. (You) If you're too
close to the green screen it will reflect some green light on the subject
and that is not good.
You hinted that you only had one light. I think you need at least 3. Most
folks would use at least 5. 2 for the green screen, 1 key, 1 fill and 1
backlight.
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