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Apple Motion Tutorial – how to key when the Apple keyer doesn’t deliver
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[Simon Ubsdell] “All you need to do it turn off this layer but use it as the clone source however many times are necessary to build the comp.”
I see. So you CAN then clone source layers in an effect. Cool!
[Simon Ubsdell] “BTW, it looks as though you’re in danger of catching the compositing bug – so beware, if you’re at all like me, you’ll soon never want to work at anything else ;-)”
Ha!
I primarily edit, but I have do a modicum of ‘compositing’ for various reasons. Color correction is a good reason, and then there’s green screen work, imperfectly shot white screen, a lot of logo cover ups/blurs/legal erasures (involving tacking etc). All of that is technically compositing/matte creation, but it’s not very fancy compared to this: https://vimeo.com/83506810). I do like to do it and I am always looking for more efficient and better quality ways to get things done.
If I were 20 years old, I’d pick up a copy of Smoke and get to work.
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Simon, I am trying to put your methods in this video to practice and not having much success. IN the image below, the guy on the left claps then turns toward the camera. In that process his shoulder and head intersect the screen on the wall while the camera tilts down to the guy sitting at the bottom of the frame. I have to replace that image of the screen on the wall with something else. I was trying to do this without manually moving mask points frame by frame and in doing so trying to use your method, but I can’t seem to get a clean matte the way you did. I put a green layer beneath my testing layer, and manipulated various parameters of the channel mixer, but no go so far. Tried threshold as well to compensate for what I couldn’t do with the monochrome mode.
Do you have any further suggestions? I realize this thread is about keying, but I thought I’d be able to apply your method to create a travel matte of sorts (a term I am not used to using in Motion; more for After Effects). Haven’t quite gotten the hang of DaVinci’s autotracker yet, but I am trying. I don’t own Core melt slice X either, but perhaps I should pick that up. This is certainly a feature I’d love Motion to have – track elements within a shape boundary rather than point trackers.
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I can’t really make out enough of your shot to be able to recommend a course of action here.
That keying tutorial was more a “proof of concept” than a method than a universal solution so it could well be that’s it’s not suitable for your shot.
The Channel Mixer method in particular is an over-simplification, albeit one that will often give good results.
But if you want a better keyer than the Apple Keyer for both FCP X and Motion then there’s only one that I can recommend and that’s Hawaiki Keyer.
The unique auto-tracking feature for the mask is pretty much exactly what you are asking for so it might well be worth checking that out.
There is a free trial version so you can try it out and see if it works for you.
Simon Ubsdell
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