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Keying advice

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Christian WheelKeying advice
by on Jan 1, 2012 at 9:48:26 am

Footage sample:

All attempts to key so far have failed due to the blue light that spilled onto the foreground. Anybody know any way to do this?

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Tudor "Ted" JelescuRe: Keying advice
by on Jan 1, 2012 at 11:35:35 am

RotoBrush may be the only thing that can save this. Traditional keying will not work because of the spill- the values are way to close to eachother. Anyway, what gave you the idea that you can actually key of that background?

Tudor "Ted" Jelescu
Senior VFX Artist

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steve agriosiRe: Keying advice
by on Jan 1, 2012 at 4:15:56 pm

I assume keying such footage wasn't in your first plan.
Even the backdrop is pleated. Anyway..

You may also have to dublicate your layer per filter such as:
color key (the best part of it is that it's not an inteligent one )
color range

Try to pull a matte for the hair using the extract filter.
The same filter under different values will keep some of the green shirt also.

color range for the shirt

for skin (hands) try to add numerous color key filter, but don't push them too far. in many cases color key will produce a decent matte but you will have to improve it using a choker or something similar.

Later on merge/precompose your layers and apply a composite choker if needed.

Roto for the headphone

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Christian WheelRe: Keying advice
by on Jan 1, 2012 at 6:37:51 pm

Thanks guys, for the suggestions, I will give them a try.

Usually this footage is pretty easy to key, it was shot using the Chromatte keying system. Believe it or not, here is a shot of just the screen from the same shoot:

The problem is that the talent got too close to the camera, allowing both the blue light to spill on himself and robbing the backdrop from reflecting it back to the lens. C'est la vie I suppose. But this was a problem for about 50 seconds of the 10 minutes of footage.

Thanks again for your help. Happy New Year!

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steve agriosiRe: Keying advice
by on Jan 1, 2012 at 10:49:06 pm

C'est la vie vraiment alors!
Donc, dix seconds...pas grave!
Bonne annee!

Best of luck then Christian !

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ben g ungurenRe: Keying advice
by on Jan 2, 2012 at 12:17:48 am

I bet you cab get a decent result with his hair and shirt (using key light, calculations, levels, etc). The skin, headphones, other bits and pieces will require rotobrush or mochaAE. If it were me I would think of this as a full roto job, and then be grateful that some of the stuff can be done procedurally. Then you are in a glass half-full situation!

Ben Unguren
Motion Graphics & Editing

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