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Green screen

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Martin RobbinsGreen screen
by on Dec 20, 2011 at 4:12:13 pm


As part of a video promoting a companies video department, they want to show they use green screen technology. They are having a presenter speak to camera with green behind them, and then when she clicks her fingers, a photograph appears as the background instead. However, the green screen behind them has some creases on it and they would like to replace it with a matte green.

I know how to do this using FCP and chroma keying, but I want to get in the habit of using Motion. Is there a way of using Motion Tracking to select the presenter and delete everything else, then adding a layer of matte green behind them?

P.s I have never used the Motion Tracking before, so may need it quite step-by-step if this is okay.

Thanks in advance and I look forward to suggestions

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zak pericRe: Green screen
by on Dec 20, 2011 at 5:38:45 pm

You woul not track this. You just need to create a mask that would be slightly bigger that the areas you want to cover, then you would animate the mask. This can be done every 5 to 10 frames depending on how much movement is in the shot than you would use a keyer to remove the rest of green screen. After that export your footage to FCP using apple pro Rez 4444 or animation codec with alpha.

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Stephen SmithRe: Green screen
by on Dec 20, 2011 at 5:51:32 pm

Which version of Motion are you on? The keyer in Motion 4 is not that good in my opinion. They added a Keyer to Motion 5.

Stephen Smith
Utah Video Productions

Check out my Motion Training DVD

Check out my Vimeo page

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