Question on lighting to avoid bleeding with screen green-CS4

I have occasional problems with some substantive bleeding. Here is an example where you can see the flare through the region of the shoulder:

BleedThru.JPG

I applied the matte choker, took the starter 1 to 0, and that's what I got:

MatteChoker.JPG

Not a bad result and simple enough, although other color settings is possible. But I think the problem stems from how I am lighting of the subject. The subject is five feet from the green screen and the camera is five feet from the subject. The bottom is evenly lit, although not very bright, using 8 to 100 watt fluorescent lamps, and there is no significant hot spots.

I think that the bleeding comes from some lighting changes, I did:

1. I moved the key and fill lights back slightly to try a softer glance (500 and 100 watts fluorescent respectively-no scrims). They came out too dark, requiring a Colorista adjustments, how I'll be back in.

2. I changed the lights background of lamps in Bowl form of work to work cone shaped lights because Bowl-shaped lights were too bright, causing some important hot spots (also without grids). However, cone-shaped lamps do not cover entirely the bulbs as the Bowl-shaped those who did it, so the subject becomes some of this light as the bulbs spread a fraction beyond the edge of the cones.

So, if it's cone-shaped lamps, so maybe I can try to return to those Bowl-shaped and just use less lamps and play with the positioning to avoid hot spots. The only effect that I use is 1.2 Keylight in CS4. But I'm really not sure I think this through properly, so I'd appreciate some tips and suggestions.

With our thanks,

Paul

In General, there is almost always backwards onto your subject. (Especially with a very bright green like Rosco DigiComp). You can reduce it by draping black curtains around the areas that are not visible to the camera.  It is less a problem with flat wall against HLM screens you walk on that.

But as usual, Rick is quite correct. Your mast base simply is not strong enough. To get a really great base key, there are only a few things you need to mess with on Keylight: matte screen > clip back and white clip.

Switch to the display. mast set the two so that your talent is completely white on the inside and the green background is completely black.  You can also use view > a vision of this status (black is 100% transparent, white is 100% opaque and gray areas are translucent. Green areas also receive despill correction.)

And that's close enough to get a really good base key.

You can see Primatte 5 for After Effects. It's a more intuitive manipulator having a mode surprisingly good one-click 'auto calculate '. You can also draw on the screen to indicate which parts to keep and what key pieces out.

Tags: After Effects

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