Primatte Question

Joined: 23 Jan 2007 Posts: 2 Location: Rochester, NY

Hello everyone. First Post here.

My question is about primatte keying. I'm trying to key an actress against a relfect media screen. The problem is that the actress is in a spacesuit that has a lot of relflective metal areas, and some of the chroma green cloth we layed down on the floor are reflecting. When I run the image through primate is changing the green areas on her suit to alpha zero and rgb zero. In other words, not only is it keying it out, but it's also changing the color.

I tried creating a holdout matte with a rotoshape, and while that did change the alpha value to 1, the rg and b channels are still 0. I thought a holdout matte was suppose to avert the keyer from that area. IS there some way I have to indicate to the keyer not to touch that area at all?

My solution was to use that holdout matte for the arm as a matte for a monochrome filter since that part of the suit should just be grey. This is working ok, but now I need to key this matte at every frame to make sure the green spot is covered in monochrome...acity so that it doesn't key black.

I guess my questions are:

1) Should primatte be doing this, and if not, how can I fix it?
2) Is this monochome workaround a good one?
3) Are there any other ideas for how to perform this key?

Thanks for any feedback!
Jesse

Joined: 06 Jan 2007 Posts: 7 Location: Norway

Would be good if you could post a pic here. It would really help.

Joined: 23 Jan 2007 Posts: 2 Location: Rochester, NY

Nevermind, I think I got it. I used a rotoshape that acted both as the a holdout matte and a green spill supressor, which helped tint the relfective sections away from green enough so the keyer didn't see them.

I think spill sponge in primate may have also done the trick.

Jesse.