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Keylight is doing nasty stuff to my footage

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Jordan MontreuilKeylight is doing nasty stuff to my footage
by on Jul 20, 2011 at 7:50:13 pm

For some reason, Keylight is taking small chunks out of my footage after it's keyed. Here is a before and after shot so you can see what I mean:

http://imgur.com/ttSLe.png

http://imgur.com/BpdMP.png

Anyone have an idea why? The screen matte looks very clear and these holes are not showing up in it.


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Dave LaRondeRe: Keylight is doing nasty stuff to my footage
by on Jul 20, 2011 at 8:16:37 pm

What holes? I see lots of noise in the keyed subject, not holes.

Use this key as a Alpha Matte for the unkeyed footage and see what happens.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Barend OnneweerRe: Keylight is doing nasty stuff to my footage
by on Jul 20, 2011 at 8:20:24 pm

It's not the matte - it's the spill supression in Keylight at work.

Usually you can get it to dissapear by tweaking the supression a little - but you can also remove the supression stage by changing the output of Keylight to (I think, I'm not at my machine right now) 'Intermediate' instead of 'Final Output' in the dropdown menu.

You may then need to use other means of removing the spill by either using a 3rd party spill killer or doing some colour correction.

Barend

Raamw3rk - digital storytelling and visual effects


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Jordan MontreuilRe: Keylight is doing nasty stuff to my footage
by on Jul 20, 2011 at 8:22:13 pm

I have several shots in this sequence and I ended up using the Keylight layer as a matte for the same footage and then using a spill suppressor on that layer. It works but I have never seen Keylight do that to some footage so I was a little confused. Thanks for your help guys.


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Dave LaRondeRe: Keylight is doing nasty stuff to my footage
by on Jul 20, 2011 at 8:34:50 pm

[Jordan Montreuil] "I have never seen Keylight do that to some footage so I was a little confused."

Well, that still you showed us isn't lit very well. The green screen is way hotter than the subject, which is a big problem for Keylight.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Barend OnneweerRe: Keylight is doing nasty stuff to my footage
by on Jul 20, 2011 at 8:37:13 pm

But still, any other spill supressor behaves much better than the one in Keylight.

Raamw3rk - digital storytelling and visual effects


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Dave LaRondeRe: Keylight is doing nasty stuff to my footage
by on Jul 20, 2011 at 9:37:17 pm

Sorry you don't like it Barend. I must say, however, that I've had decent success with it. I pull the key properly in Keylight to use as an Alpha Matte, and duplicate the layer. Then on the lower layer, I mess with the Keylight settings until the chroma key background turns gray.

Combined with the alpha matte, it looks pretty good.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Barend OnneweerRe: Keylight is doing nasty stuff to my footage
by on Jul 20, 2011 at 8:36:09 pm

It's exactly what I do. Most of the time it's more subtle but Keylight's spill supression always introduces noise - so I never use it.

Raamw3rk - digital storytelling and visual effects


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