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Still more green screen woes!
A while ago I posted my troubles getting good results with some green screen interviews for a documentary, and got a lot of help that led me to improving my work a great deal. Now, almost by accident, I discovered that I had not exported my footage from iMovie (all I have to work with right now), taken on a Canon GL-2, at the highest resolution possible in the first place and thus some of the poor, see through edges and the like were a result of that initial error.
I re-exported some footage as an MOV file with no compression, brought that into AE and after reviewing the great Andrew Kramer tutorial on basic color keying techniques, got much improved results. The images are sharper, the edges cleaner, just better overall. I am still losing a little edge of the subject’s glasses but I suspect the only way I’ll keep that is by rotoscoping.
The ONE new problem I now have is some fairly subtle flickering within the subject’s shirt. He’s wearing a solid blue shirt, and there’s some noise only within that area. The face is okay, and the background still image is fine. I tried to use the Reduce Interlace Flicker effect but all that seemed to do was create blur.
Any ideas out there?
Thanks!
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5 Replies
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Heya.
After doing the colour keying to your satisfaction, duplicate the video layer of the blue shirt (so it ends on top of the actual key layer, make a “small” mask around the area of interference and disable the colour key on that layer/mask.
Of course, supposing here, youre working with a static shot, or else youll need some additional roto-tooling with the mask key points..
Hope it works.
Angry Arts
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Well, there is some movement as the person talks. Leaning back and forth, etc. I was hoping there was some simple setting I could apply! Any idea why the effect is happening? Is there too much green in the blue color of the shirt maybe?
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I am pretty sure you need to make a change in your keying settings – I have this all the time – sort of chatter/noise in the unkeyed area…
In the area called Screen Matter – you’ll find a property called “Replace Method” – set it from “Soft Color” to “source”
Unfortunately this brings some of the reflected green tones back into it, but it does get rid of the immediate problems.
From there you may want to go into the foreground color correction area, enable color correction, and go into the color Balance > Color Balance Wheel property and slide the color away from green towards the pinks and reds – just slightly.
You might also want to use the effect called Effect > Keying > Spill Suppressor to get rid of any leftover greens around the edge.
Aharon Rabinowitz
Email: arabinowitz (AT) yahoo (DOT) com
All Bets Are Off Productions, Inc.
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I reckon the colour key built in AE is a very picky one.. Disturbing little pixels denoting scales of green which AE basic keying has trouble identifying. The whole keyframing of ´the mask isnt difficult at all.. try keyframing start and end and then correct inbetween. Shouldnt take more than 15 minutes. OR try using the colour key with high tolerance and add the keylight 1.0 and set it to key green as well. OR try another shade of green for keying.. Either way, it should sort out neatly.
Angry Arts
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Try just clipping some white from the Screen Matte tab inside Keylight, while increasing ple-blur a bit
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