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Keylight & noise
Hello. I am doing a green screen project (pretty well lit, not the best but far from the worst) shot on DV50 imported in at 10 bit uncompressed and deinterlaced (pulldown removed on capture so my footage is now 24p). No matter what I do I seem to inadvertently add a bunch of noise to everyone’s shirt after keylight is applied. The screen mask is all white where it should be. Is this something that I am doing wrong? the keys look pretty good otherwise. It seems to me I have a setting wrong , but I can’t figure out what it is. All people have different color shirts on as well, it’s weird that everyone’s shirt gets noisy.
Does anyone know of a fix?
Jeremy
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5 Replies
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Try changing mode to soft light or hard light, whichever it isn’t.
Andrew
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Switch to ‘Intermediate Result’ which turns off colour correction (and I think spill suppression too) and watch the noise disappear! Unfortunately, I bet your edges are now not as nice.
Crank the clip black and clip white values!
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Change the replace method to source (this option is only seen if you twirl down the screen matte options). You may noow see some color on the edges, use the splill suppresor, or soften your edges and shrink the matte (use the screen grow with a negative value).
Mark
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I noticed the same problem, thought it was DV artifact, started shooting Beta and ingesting 8bit, same problem. Here’s my fix. Set up key with Keylight viewing Final Results and just ignore the noise for now. When you got the key set up how you want it, duplicate that layer, put it on top, change Keylight settings to: View> Intermediate Result, Screen Shrink about -7 and Screen Softness about 5. Finally change the blend mode of that layer to Lumonosity. Doing this should clean up any noise generated by blacks.
Andrew
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Thanks all for the tips, I will let you know what works. I have been rough cutting the piece so I haven’t had time to get back to keying yet. I will have time later today to start playing again.
Salud.
Jeremy
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