Newbie - how do you isolate a persons hair from blue/green screen?

[Dutchman]

I don't know if I give an answer to your question (I don't know that footage your talking about), but I can give it a try:

You have your footage, select it, add a chromakey to it (with a wire between both ;) ). Select that chromakey, and select in your view the color you want to put away. You can tweak the controls (matte blur etc). If you want to invert the mask, check invert ;) ...

Maybe it isn't the answer, but maybe it is ;)

Greetz & good luck, Gijs

[no_clue33]

Thanks Dutchman, but I know the basics of how to do blue/green screen and can isolate a solid object like the body of a human without too much trouble, however because hairs are fine and transparent and can be all over the place it seems impossible for me to isolate the hair properly. However I've seen it done many times before so it's obviously possible, but I just cant figure out how to do it and can't find any help on the internet so I'm kind of stuck.

[Jayk2k]

Each shot is going to be different. There are a few techniqes to try, but some are quite involved.

First thing to try is another brand of keyer. They all have their strengths and weaknesses, so one keyer's performance may be better on any given shot over another. Just experiment and see which one gives you the best result.

Next is to combine multiple keys, tuned for specific parts of the image. You will almost never find a one click solution to a green screen. Garbage mattes are your friend. By combining a solid matte for the person, and a second for the hair, you will get better results.

Finally, is to do a min/max key of each color channel independantly to maintain as much detail as possible. If you want to know more about this, the best thing is to grab a copy of Steve Wrights book, digital compositing for film and video. In there he explains in great detail how to extract each color layer independantly, to get the best result.

[no_clue33]

Thanks a lot Jayk2k, I think I might pick up that book you suggested :).

Cheers

[aqua_000]

I have no Idea how to make any of the things I have seen on CG talk. Can anyone tell me how to make stuff like those amazing characters I have seend people making?

[beaker]

I have no Idea how to make any of the things I have seen on CG talk. Can anyone tell me how to make stuff like those amazing characters I have seend people making?Don't ask broad questions like this. It will never get answered. Think of it like going to a car mechanic and asking him to explain in words how to build an entire car from scratch or tell him to write it down for you. He will look at you an laugh or tell you to piss off.

[depleteD]

Um well this is what I do in photoshop im sure the same technique can be applied to df

I take the blue channel or the highest contrasted color channel and turn it in to a mask
then i do level adjusts to pull the person from the background.

Then I go over the hair areas with a burn brush.
Tweak a lil bit.

Hope this gives u an idea

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