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How do they get rid of Track Points on Chroma?
I have noticed in the BTS of DVD, there are cross-hairs and other types of track points (not in green or blue). How do they get rid of these – I assume they use them to track the background etc, but when they are on the greenscreen and they key it out – shouldn’t the track points still be there and therefore in the shot? Is this erased by keyframing like when they get rid of wires and cables from shots?
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5 Replies
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A second key on the dots would work well. If there are issues, there’s always good ole’ rotoscoping.
HTH
Roland Kahlenberg
https://www.broadcastGEMs.com – Adobe After Effects project files
https://www.myspace.com/rorkrgbspace -
A second key usually won’t work because it takes out portions of the subject with it (this is why chroma key screens aren’t white). So you have to draw garbage mattes around your foreground elements that keep the green around the subject but mask out the white reference points.
However, even that doesn’t work when the subject crosses over one of those points.
My solution in my own work when that happens has been the aforementioned “good old rotoscoping.” Any one have a better, faster, bolder solution?
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Aren’t those crosshair points used to track objects, for instance 3D generated graphics that overlay over video such as the characters Pirates 2? Is this the same thing you’re taking about? What DVD are you referring to?
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Personally I always try to avoid rotoscoping whenever possible. Best case would be a rough holdout mask around the talent and a second pass key to remove the bulk of the markers. But you’d need some roto work where the talent passes in front of markers.
JD
John Dickinson
Motionworks
http://www.motionworks.com.au -
i agree with john.
roto should not be necessary to remove most if not all your markers if its shot well.
clean up when they cross behind an actor maybe necessary but a garbage matte and a 2nd key should do the trick
Now if for some reason the above doesnt work, you could always do a quick track on the point and use that to remove the unwanted markers from key
who is that masked man…
https://www.exposedideas.com/
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