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keylight adding an alpha matte

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Esther Casaskeylight adding an alpha matte
by on Nov 12, 2009 at 7:57:29 pm

Hi everyone,
I have a simple shot with bluescreen but I am not an expert with keylight and like t know what is the best thing to do:

the shot: people moving in a park with the background being a bluescreen behing trees.

problem: i can't keylight all the shot as some people is wearing blue clothes

suggestion I got: someone told me to create an aplha channel and then pre-comp...

what i did: first keylight the bluescreen on footage.. Then duplicate layer, and then create from this layer the alpha channel: the problem is still the same, the blue form teh clothes is still keylighted...

question: at the beginning i started doing a mask around thebackground and keylighted that mask, but as the mask is not very easy to do in this shot, someone suggested to do the pre-comp with adding an alpha layer.So, what is the step-by step to do alpha channel correctly and pre-comp?
thank you so much!

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Laurie TurnerRe: keylight adding an alpha matte
by on Nov 19, 2009 at 8:55:14 pm

I think you will have to duplicate the layer then rotoscope the blue shirt people.

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