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Posted by Richard Crowley on 11/10/06 16:22
adric22 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.
How closely did you match the exact color of green?
> 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.
You have a problem in such a small room. Some people have found
it useful to light the greenscreen with fluorescent lights. Regular tubes
have a strong green spike which is an advantage in this particular case.
Those "shop lights" go for $10~20. Be sure to get the kind with
electronic ballast, not the old heavy magnetic ballast. (Because the
electronic ones don't flicker).
> 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?)
If you have no way of defeating the auto white-balance, you are
essentially screwed. Those inexpensive cameras were never intended
for such sophisticated applications. You could always try "luma-key"
where you use a completely dark background (black velvet, etc.)
depending on how you are going to composite your video together.
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