Minus Green, ND Gel for Chromakey Ceiling Spill

Ken1212 said:
Right now I turn the room's ceiling light off when taping. My subjcet stands straight under it, it's a two halogen bulbs fixture, would it be helpfull to put on couple CFL bulbs and use it, would that do much to the spill, how about adding minus green to it? The ceiling will be coverd with black poster boards.
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in lieu of a hair light? if it works. sounds like you wouldn't have a lot of control over it (color, angle, intensity), but sometimes the stars align....
 
Don't over produce. We're trying to solve a highly technical problem here that is compounded by logistical restrictions placed on the project. The OP wants to create a visual effect in his playroom that requires highly specialized skills. Effective greenscreen production is taxing enough under the best conditions. Most successful greenscreen effects are staged in a studio of sufficient size to accomodate equipment, set and idiosyncratic requirements of the process. If the greenscreen effect is germain to the story then hire a studio and do it properly . . . or re-write the script and eliminate the costly effect.
In this instance I suggest blowing the greenscreen ideal off and develop an alternate approach, , , and get about it.
 
To get back to the poster's original question...

I've often stapled black seamless paper to ceilings (not for green spill but for dark shots). Kind of takes two people to do it without a lot of profanity, but if you're in a room with 9' or lower ceilings and need to knock the ceiling down (and the location is OK with staple holes) it works well. I've done it across a half of a ceiling, sometimes just a 4x4 spot.
 
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