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Green Screen Problems ASAP

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Josue Silva
Green Screen Problems ASAP
on Nov 24, 2012 at 10:28:40 pm

Hello, currently working on a music video and a huge problem came up. I was using a green screen as a backdrop and green light leaked onto the keyboard and drum set. When I tried keying out the green, part of the keyboard and drums erased. I was wondering if there was an option in Final Cut 6 or Motion 3 to prevent these from getting erased. Are there any filters or deselection tools that I can apply on the keyboard or drums? Please let me know as soon as you can.


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Josue Silva
Re: Green Screen Problems ASAP
on Nov 24, 2012 at 10:32:03 pm

If anyone needs to see a screen shot of the image please let me know


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Greg Ondera
Re: Green Screen Problems ASAP
on Nov 25, 2012 at 4:28:07 pm

You might try doing a garbage matte of some kind, or doubling the layers of the video without offsetting the synch of the timing of the two layers and crop the top layer down to the keyboards but not apply a matte to that top layer. You'd keep the green color tones on that top layer then. If it's a moving shot then you'd just have to follow the crop edges. It should be seamless.

Backing up, do you know how you got the green spill? Not that this is important to solving this, but I am interested.

Greg Ondera
http://www.Plexus.tv
http://www.SurgeonToday.org


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Mark Suszko
Re: Green Screen Problems ASAP
on Nov 25, 2012 at 4:34:10 pm

What I might try is isolating the drum area in a mask and applying color-correction to the spill areas, then rendering out a new reference movie.

Also, which Green Screen Chromakey plug in are you using? Primatte comes with FCP and it works better than the built-in CK software, has more precision.


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Greg Ondera
Re: Green Screen Problems ASAP
on Nov 25, 2012 at 5:00:53 pm

I use Primatte. I often use a sequence of filters: Matte Magic as the first applied filter, then Primatte RT, then Color Smoothing on top of that. I forgot where I got that formula from but it's been nice to me.

Greg Ondera
http://www.Plexus.tv
http://www.SurgeonToday.org


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Greg Ondera
Re: Green Screen Problems ASAP
on Nov 25, 2012 at 5:14:13 pm

Just checking my sources and I might have gotten that formula from "Greenscreen Made Easy" from Hanke & Yamazaki, or "The Green Screen Handbook" by Jeff Foster. Likely its from "Greenscreen Made Easy." Note the spelling in both titles. I also have a Reel Classroom DVD by Carl Gundestrup titled "Light On Green Screen Lighting." It's been a while since I've referred to these.

So I'm interested in if you think you could have avoided the green splash by flagging off the reflection or would the flag have come into the shot? Would a green flag do the trick then? Just wondering about tricks that could work.

Greg Ondera
http://www.Plexus.tv
http://www.SurgeonToday.org


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Josue Silva
Re: Green Screen Problems ASAP
on Nov 25, 2012 at 5:22:15 pm

Thank you everyone for the posts and suggestions I will try them. I think I got the spilling for unbalanced lighting. It didn't help that the instruments I was using were shiny either. I should've had more light coming from the sides and bottom. I haven't tried a mattes flagging or color smoothing. Are there any video tutorials on how to do these that you can forward me to? Thank you all!


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