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Using alpha channel with keylight
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!
e. -
1 Reply
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Hi, well, actually this was thought very well,so that is not the issue here.
I just wanted to know how to do an alpha channel, as it was one suggestion i like to follow.
does anyone can tell me how to do it?
the shot is just a sky to keylight, and like to know how an alpha channel will work together with keylight and why?
thank you!
E.
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