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Posted by Maxheadspace on 11/14/06 01:13
Some of my green screen I made myself. A king-size white, flat bed sheet
with some melon colored flat latex paint. The paint stiffened the sheet to
canvas stiffness. Color is great. Like you, I had some problems with
shadows on the sheet due to it not hanging perfectly even. To compensate, I
do my keying with "color difference matte" tool. With color difference, you
can add different shades by clicking on each patch that doesn't key out
right away. The color ranges are cumulative, so you can add multiple
shades, cleaning up just about any hue that you want eliminated. I'm using
Adobe products, both After Effects and Premiere Pro, which have this
feature. I'm pretty sure a lot of the other NLEs have it as well, maybe
named something else.
I agree with the other posts that a big problem for you is the space you
have to work with. I light my background and the subject separately from
the sides. Frontal light on the subject leaves shadows on the green screen.
It's critical to get some distance between the subject and the screen.
As for the white balance, try putting your white stock in front of the
camera when it's off, then turn the camera on with the white still in front.
A lot of cameras go through a white balance on power up. I learned that
taking underwater video where I couldn't manually adjust white balance
through the housing. It may pay off for you.
Good luck on your keying!
Max.
<adric22@yahoo.com> wrote in message
news:1163172654.599802.223630@b28g2000cwb.googlegroups.com...
> 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?)
>
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