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Keylight problem on noisy (video) footage

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mark thompsonKeylight problem on noisy (video) footage
by on Jan 29, 2015 at 11:04:20 pm

Hi, I have a problem with Keylight on noisy footage. The person talking is in a studio with lots of light on a good green screen. Keylight keys the subject out but I omitted to light the legs below the knee. When I look at the source footage you can see noise there but when the key is applied it gets very noisy.
If you look at



from surfaced studio, at the end 5:54 on the Osaka Snake shirt you can see the effect I'm experiencing. However mine is much worse when I render.
Anyone have any ideas what can be done to damp it down?

CC 2014, footage is 50 MHz 4:2:2 25p.
thanks
Mark


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Dave LaRondeRe: Keylight problem on noisy (video) footage
by on Jan 30, 2015 at 12:05:28 am

Keylight's a good keyer, it just likes green screen backgrounds a little dark. Sounds like yours might have been a little bright.

I handle the problem by using the keylight status window to ensure that the key is right: solid at the core, gray edges. Once it's good, I change it back to the final output and use it as an alpha matte for an unkeyed duplicate layer of the shot.

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


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Todd KoprivaRe: Keylight problem on noisy (video) footage
by on Jan 30, 2015 at 12:09:14 am

Use the Key Cleaner effect with Keylight:
http://blogs.adobe.com/aftereffects/2014/04/new-changed-after-effects-cc-20...

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Todd Kopriva, Adobe Systems Incorporated
After Effects product manager and curmudgeon
After Effects team blog
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mark thompsonRe: Keylight problem on noisy (video) footage
by on Jan 30, 2015 at 10:30:05 am

Todd,
thanks for that suggestion. I have to study it some more but I latched on to "Reduce Chatter", otherwise using default settings, and it made a huge difference.


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mark thompsonRe: Keylight problem on noisy (video) footage
by on Jan 30, 2015 at 10:34:36 am

Dave thanks for that. I will try that approach after I've done some re-shoots.
mark


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Tudor "Ted" JelescuRe: Keylight problem on noisy (video) footage
by on Jan 30, 2015 at 7:30:55 am

Use Intermediate Result from Keylight - this solves a lot of noise issues.

Tudor "Ted" Jelescu
Senior VFX Artist


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mark thompsonRe: Keylight problem on noisy (video) footage
by on Jan 30, 2015 at 1:17:53 pm

Ted,
could you expand on that a bit?

thanks
mark


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Tudor "Ted" JelescuRe: Keylight problem on noisy (video) footage
by on Jan 31, 2015 at 8:17:31 pm

Using the "Intermediate Result" instead of the "Final Result" in Keylight removes some of the automated colour correction which can introduce artifacts and noise. I have been using this setting in most of my chroma projects combined with AE's Spill Reduction and it works for most of my work. Of course in most projects I use the same tested setup with a well lit chroma and plenty of light, but I found this to work just fine in chroma footage that I received from other sources with a not so great setup.

Tudor "Ted" Jelescu
Senior VFX Artist


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