After Effects color keying

Hi,
I have a problem which I can't seem to find a solution for, and I'm not convinced that there is one either.
Basically I have a dancer shot in front of a green screen. The dancer is wearing clothes that are bright, different contrasting colors. The reason for this is that I want to select the clothing and change the colors of the various parts.
In the green screen shoot we flattened the lighting to minimise shadowing to make it easier to pick out the color. What that has done is effectively washed out the vibrancy a little bit.
In after effects the dancer has black make up around her eyes and mouth and a purple top. In the video the black make up seems to have picked up some purple for reasons I don't know (compression? reflection?) and so I have purple pixels on her face as well as on her top.
Is there a way to separate the purple pixels in the face from those on the clothes? Bearing in mind this will be a 3-4 minute video and not a still image.
I hope someone out there can help me

d.sprowls is pointing you in the right direction. For some more detail, here are two videos that I made that show a couple of different ways to isolate and apply an effect to only a person's face:
Isolating a subject with the Roto Brush tool
Motion tracking and rotoscoping
These should give you some ideas and get you going.

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I have not had any problems until I started trying to use a green screen, which has turned out to be a major pain. Ultra key did a good job, but I kept being told the after affects does a better job. My computer is a PC has 32 Gigs of ram a 4 gig video card, I7. I also just downloaded all the latest updates. I imported an AVCHD file after shooting a 30 min lesson on green screen. Had to do a lot of editing to get all put together so there were lots of cuts and I had alot nested sections so I can resize myself with the background to keep the perspective correct. After I had decent success with keying, though I wish it were better, I tried moving each indivdual video clip over to after effects to key in there. It looked like it might have been a little bit better than the using ultrakey. I tried serveral different turtioals, but finally found one that seemed to work pretty good. (BTW if you have a favorite turtorial that you like on keying, please share.)
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http://audiovisual.at/download/3dlut.zip
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thnx

I do have a vested interest in this, but LightSpace CMS from Light Illusion can hlp with LUT conversion, etc.
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Steve Shaw
LIGHT ILLUSION
[email protected]
+44 (0)7765 400 908
www.lightillusion.com
Skype: shaw.clan
LUTs, CUBEs + GAMMA CURVEs

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Mylenium

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BJBBJB1

Thanks so much Dave. It fixed the problem.
Raoul.

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