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Green screen hair keying problem

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Vasik GreifGreen screen hair keying problem
by on Jul 23, 2014 at 7:05:39 pm
Last Edited By Vasik Greif on Jul 23, 2014 at 7:06:39 pm

Hi everybody, I have quite a problem keying out the actor from this clip:

http://ge.tt/7eS4yDp1/v/0

Anyone knows a way to retain her hair? I normally use the method from this video:



, which usually works pretty well, but I cannot get the hair in this clip right...

Thanks for help


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Dave LaRondeRe: Green screen hair keying problem
by on Jul 23, 2014 at 10:42:34 pm

You may have pull the key for the hair on another layer and animate a garbage mask around the non-hair parts of the subject.

Sometimes getting a good key takes a good bit of work.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Vasik GreifRe: Green screen hair keying problem
by on Jul 24, 2014 at 9:07:46 am

Thanks for reply Dave.

I don't seem to be able getting good hair even when I focus on the hair only. Is there any trick to make that better? And, as we are supposed to do more of this kind of "hairy" stuff, are there some reccomendations for lighting etc. to make it easier next time?

http://vasik.net


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Jon DoughtieRe: Green screen hair keying problem
by on Jul 24, 2014 at 6:02:26 pm

This technique has often helped me pull better keys. . .

http://tv.adobe.com/watch/creative-cow-after-effects-tutorials/super-tight-...


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Vasik GreifRe: Green screen hair keying problem
by on Jul 24, 2014 at 9:25:29 pm

Thanks, I love this technique!

http://vasik.net


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Dave LaRondeRe: Green screen hair keying problem
by on Jul 24, 2014 at 6:26:16 pm

Show us a screen shot of the video causing you problems for diagnosis. We don't know your current lighting conditions.

Also know that video like H.264 (like DSLR stuff) and AVCHD are pretty bad to use for chroma keying. A lot of the shots color information gets tossed away during the recording process, and can NOT be retrieved -- transcoding to a different codec doesn't re-invent the missing information. And what do you need for a good color key? Why, good color information, of course.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Vasik GreifRe: Green screen hair keying problem
by on Jul 24, 2014 at 8:49:26 pm

Thanks for replies. I posted the clip in my question, here it is again for download:

http://ge.tt/7eS4yDp1/v/0

It was shot on DSLR and than exported to h264, so don't take the quality that much into account - I'm more concerned of some generic guidelines how to make the job easier next time - obviously, shooting on Blackmagic 4k Cinema Camera we own instead of using DSLR should help...

http://vasik.net


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Dave LaRondeRe: Green screen hair keying problem
by on Jul 24, 2014 at 9:20:46 pm

Ooooh, all that wispy hair at the base of the neck! That's going to be an ongoing problem with h.264 DSLR video. The hairs are so thin that there isn't good color detail betweeen hairs and the green background in the h.264 codec.

The only thing that MIGHT help is to darken the green screen a little. Overall lighting looks nice for chroma key.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Vasik GreifRe: Green screen hair keying problem
by on Jul 24, 2014 at 9:27:56 pm

Thanks for help.

Probably my last question would be, how to split the image to be able to key head+hair only and the rest of the body. I tried to just duplicate the footage with keylight applied and applying a mask to each of the layers, which ended with a small gap between the masks, even when the two masks overlapped. Do I need to precompose the layers somehow or?

http://vasik.net


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Dave LaRondeRe: Green screen hair keying problem
by on Jul 24, 2014 at 10:18:32 pm

Two layers with keylight... a mask on each layer... and the mask on each layer overlaps the other layer's mask. There should be no problem. I'm sorry, but I have no good answer for your masking difficulty.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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