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I suggest you start reading on chroma keying, mattes, overlays, alpha channels, scale, motion, all the basic NLE techniques and follow some tutorials.
Harm is correct. You will need to follow the manual or the tutorial to learn this in AE. No one here could or would guide you through every step in this fairly complicated process. Feel free to inquire if you have specific questions about how to improve your initial results.
I will do that.
One question I do have is I am assuming the effect that moves the face (picture) with the body (video) is tracking motion?
And is chroma keying required? Couldn't I just have the image on top of the video?
Simon, that's correct, it's known as "Motion Tracking". You may even be lucky enough to find sort of tutorial on the web. It involves telling AE which pixel group you want to follow then anchoring the other comp to that group.
If you can't figure it out, the book After Effects Apprentice has a good section on Motion Track.
If the face image is a still, then you may not need to key. Just a really good selection in Photoshop to strip the background, then bring that PSD file into AE.
Good luck. you've set yourself a bit of a task there...
Along the lines of your second post, Matthew's and Harm's replies, if you are looking for a bit of a "cartoon" effect, I'd take the facial shots into Photoshop, and size them accordingly. You Video will be on VT 1. You can then use the "Logo" (inserting a photograph or graphic) in the Titler. Your Title(s) will go on VT2. You'll need to do Motion>Location Keyframing (that is a very worthwhile topic to read up on) to get your "Logo" over the body and follow its movements. Depending on how linear the movements are, it could be simple, or quite tedious. You can even change the "Logo" by creating another Title with a different face, or expression. It too will need to be Keyframed. If it's just the expression, I'd probably Butt-cut between the two Titles, but you could do a Cross-Dissolve.
You can do more to your "Logo," like Motion>Rotate (slightly) to get the head to kind of rock back and forth.
Thanks for all the good advice.
I will look up the motion tracking tutorials and try it out.
I have Photoshop so preparing the image is not a big deal.
Hey simon Zimmer,
Check out this great tutorial - http://maltaannon.com/after-effects/simple-object-removal/
It motion tracks a mask over a crack in the wall but if you can wrap your head around it then motion tracking a mask over a face shouldn't be that hard if it's a fairly noncomplex movement.
Great tutorial. I just found a solution for two problems, sitting on my desk with that!