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Noise in Key
I’ve got some footage that I’m keying: Green screen, shot on DV, brought in with Blackmagic 10bit 4:2:2 via Component, using keylight on AfterEffects 7 Pro, MacPro with Intel chips. The key looks good, but people’s hair and black or white shirts are picking up a lot of digital noise. The edges aren’t the problem at all. The parts effected don’t even have any green spill. Is this a Keylight bug? (It doesn’t show up in the footage until after using keylight)
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5 Replies
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That noise is likely compression artifacts in the green channel that get removed by applying the Keylight effect (leaving ‘holes’ in the footage). I’ve heard tell that you should de-noise your footage first. Just tell. I’ve never done it myself. Maybe there’s something in the forums about it.
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[IndieSoon] “Green screen, shot on DV, brought in with Blackmagic 10bit 4:2:2 via Component”
Just curious, is there really a benefit to bringing DV footage in at 10bit 4:2:2?
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My experience with DV being captured via firewire is that the footage ends up with a lot of digital noise that you don’t notice until you do something like keying. The noise will prevent you from getting good edges. I’ve been coming in 8 or 10 bit via component on a blackmagic multibridge, and it smooths out all the noise.
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Does it actually do a good job of upconverting the 4:1:1 color compression?
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The BlackMagic card does a great job of upconverting from 4:1:1. It looks just like seeing DV being played off the original tape onto a really good broadcast monitor.
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