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Flicker

Posted: Wed, 23rd Mar 2005, 3:48am

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hatsoff2halford

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Hey,
I have some green screen footage and it keys pretty well except there is a flicker around my actor when it is played? There was a previous post on this and it had to do with erode, I haven't used that so i'm not sure whats causing the problem. Any help would be greatly appreciated. Thanks.

Logan
Posted: Wed, 23rd Mar 2005, 10:26am

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Simon K Jones

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You probably need to light your greenscreen better. Flickering around the edges occurs when the edge of your subject is indistinct. You could try adding a slight blur to the edge to disguise the flicker, perhaps?
Posted: Sat, 23rd Apr 2005, 8:48pm

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A Pickle

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Yeh, I had the same problem.

Turns out my first few movies are definitely going to be movies/greenscreen lighting footage...s...

Yes. Anyways, I used it a lot for Dew Trek (which should be coming out soon!), and I had two problems. A huge, overlit white spot which I had to smatter using a garbage matte... and bad lighting, where my shadow and my friend's shadow overlapped.

I need a better screen. biggrin
Posted: Sun, 24th Apr 2005, 6:28am

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BlueSmudge

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In my latest film I found that setting up a greenscreen outside on an overcast day works extreamly well. Outdoor lighting provides very good flood lighting (obviously) so the ammount of lights decreases. Usually all you need is a 500 Watt light or two behind the actors. But sometimes none.

Also, the flickering should decrease a little bit in the final render. At least it has in my experiance.
Posted: Sun, 24th Apr 2005, 6:33am

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hatsoff2halford

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My screen is now evenly lit, but I use hi8 so the quality isn't very good.
Does ligthing the actor from behind help a lot? I was thinking it might because it would sharpen the edges quite a bit...Not sure though!

Thanks

-Logan
Posted: Sun, 24th Apr 2005, 6:44am

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BlueSmudge

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It definately helps, but its hard to acheive. Plus you can end up with a "halo" around your actor which looks bad even if it makes a good key. If your footage looks pretty good just give it a go in chromanator and play around with the controls. Make sure to use key grading, that makes the biggest difference.
Posted: Sun, 24th Apr 2005, 6:10pm

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Evman

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A good way to eliminate this is to set up one or two lights behind your actor, so that the edges of their body are illuminated... especially the hair. Then you can key it, and have a nice, defined edge, that you can then erode to evenly get rid of it. A good way to get exacting hair is to use that method, and then a luminance keyed layer above the regular greenscreened one.