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Still image of a face onto a moving body

Posted: Tue, 25th Aug 2009, 10:30pm

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FXhomer85209

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Any body know how to put a picture of a face onto a moving body in a movie?
Posted: Tue, 25th Aug 2009, 10:49pm

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rogolo

Force: 5436 | Joined: 29th May 2005 | Posts: 1513

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You will need to do some heavy keyframing, or, better yet, motion tracking. This requires software such as FXhome's Lab range of products (found here) or a good piece of editing software, such as Final Cut (Mac) or Vegas (Windows) to do keyframing. For motion tracking, you'd have to shell out a bit more for a program like After Effects.

Keyframing would involve moving the picture of the head to match the body at specific intervals - usually every couple of frames. This results in anywhere from 5-15 keyframes per second of footage, depending on how accurate you want to make it.

Don't expect your footage to look realistic, though! Doing the effect properly involves a decent amount of time and skill with an application capable of motion tracking, like After Effects. And, even then, a still image will not look photorealistic when superimposed over a moving body. smile
Posted: Tue, 25th Aug 2009, 11:35pm

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Axeman

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Indeed, to add to rogolo's post, this will only work at all well if the head of the moving person, NEVER turns even the slightest bit. As soon as the head turns even one degree, and the image of a face doesn't, it becomes painfully obvious that its a composite. If the head is moving, then you either need to film the face that will be composited on making the exact same moves as the original face, or else use a 3D version of the face to lay over the original.

If you are using the idea to comic effect, however, then what I've just said may be irrelevant.