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Do you ever do any pre-processing before you key?
Hi guys
Im having a difficult time pulling a key (green screen) off some DPX files in a 32bit comp. The camera is on a crane looking down at talent. The shadows are directly underneath the talent, however the talent is whereing darkish grey pants. Im unable to pull clean keys around this area and my rotoscoping is quite poor.
I was just wondering if there are ways you guys use to pull more successful keys, like pre-processing, saturating greens, raising shadows etc.
Thanks guys
Chris -
4 Replies
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This tutorial shows a pretty creative way to roto your footage.
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thanks.. thats a great tutorial. will use that when i next have a keying job.
But if anyone else has any tricks they use to enhance the key, before they pull it, i’d love to know.
Cheers
Chris -
sounds like you should be pulling separate keys for the talent and the shadow
who is that masked man…
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It also depends on what the source for the material is. You mention dpx files. Are you working on film scans? Or was it some flavour of HD video?
If your source was HDCAM or DVCProHD, I’d de-artifact first. There’s a good de-artifactor in Red Giant’s Key Correct Pro. There’s a similar one in Magic Bullet if you happen to have that.
Then I usually do a grain removal pass, using AE’s Remove Grain. Even if the grain is hardly visible, it will result in less edge jitter on the key, and less noise in the semi-transparencies.
If your material is film scans, skip the artefact removal, but just add the grain removal.
No fix for bad lighting, and it will result in slower rendering, but it should improve quality of the edges of the matte.
Bar3nd
Raamw3rk – digital storytelling and visual effects
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