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Keying everything moving in a lock shot

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Matthieu Laclau
Keying everything moving in a lock shot
on Jul 27, 2016 at 1:59:41 pm

Hi,

I'm starting working on a project where most footages are coming from surveillance cameras.
Most of the shots are locked, with people or car moving inside the frame.
I'd like to key everything that is moving. So then, I can add a effect on the moving object (like in the attached picture).
Wen the object stop moving, then it becomes normal.
I can use After Effects, but if it would be possible to do that in Premiere, it would be even better.
Any other app could be fine as well.
Best,

Matthieu.



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Ken Teutsch
Re: Keying everything moving in a lock shot
on Jul 27, 2016 at 2:38:45 pm

You can roto the silhouette, of course, but that's a pain...

But if you have a frame without the person in it to use as a clean plate, you could grab that frame, then use the Difference Matte effect to cut out the moving object and reveal a layer underneath with your red effect applied.


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Matthieu Laclau
Re: Keying everything moving in a lock shot
on Jul 27, 2016 at 2:53:11 pm

Ken and Dave,

Thanks for your fast answer. I'll try that.
It doesn't have to be very precise. It can look "dirty", so I guess using the clean plate and the difference matte should work. Hopefully, I might have clean plates on most of shots.
We're working on real surveillance camera footages and I'm editor of the film.
I just want to be able to make the effect approximately to see how it looks, during the editing.
It should be possible to do the same in Premiere I guess, right?

Matthieu.


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Ken Teutsch
Re: Keying everything moving in a lock shot
on Jul 27, 2016 at 2:58:05 pm

There is a difference matte effect in Premiere. I haven't used it in Premiere, but I assume it works more or less the same as the one in AE.


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Walter Soyka
Re: Keying everything moving in a lock shot
on Jul 28, 2016 at 1:42:29 pm

I would use Twixtor Pro to generate motion vectors from the shot, then create a matte from that.

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter]   |   RenderBreak [blog]   |   Profile [LinkedIn]


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