Mapping images over movies in FCP?

Discussion in 'Digital Video' started by Petey05, Jun 25, 2008.

  1. Petey05 macrumors newbie

    Joined:
    May 2, 2008
    #1
    Hi. I'm a FCP novice.

    I want to enter the Colbert "McCain Challenge" where a greenscreened version of McCain is placed in "interesting" situations.

    Somebody made this youtube video: http://www.youtube.com/watch?v=8G9jA-FGGd8

    Where they took his head and mapped it over the body of one of the performers. I want to do the same thing for another music video.

    I've already chroma keyed and cropped til I have just his upper body (still need to crop down to the head) but what I don't know how to do is map it to the head of one of the performers the way the other guy did. I don't even know what that technique is called so I can't do any research on my own.

    Any info that might point me in the right direction would be greatly appreciated.

    Thanks!
     
  2. AviationFan macrumors 6502a

    AviationFan

    Joined:
    Jan 12, 2006
    Location:
    Cedar Rapids, IA
    #2
    That's a funny video - I like the idea!

    As far as "mapping" goes, do you mean to move the position of the image around so it matches what it's replacing? I think your best bet is to define keyframes for the position (and maybe the scale) of the image. There is a feature called "tracking" in Shake (maybe in Motion too? not sure...) which automates this process, but it requires an easy to identify point that it can track - you may or may not have such a point.

    Or did I misunderstand your question?

    - Martin
     
  3. Petey05 thread starter macrumors newbie

    Joined:
    May 2, 2008
    #3
    I'm trying it in Motion. It's very hard because the "Thriller" video is dark!

    Actually the biggest problem I'm running into in FCP is that I can't figure out how to key just McCain's face. I can use the green screen to get his upper body in the video, but I can't key on his face no matter what I do. Is there some sort of "color based crop feature" besides chroma keying that I'm missing?
     
  4. AviationFan macrumors 6502a

    AviationFan

    Joined:
    Jan 12, 2006
    Location:
    Cedar Rapids, IA
    #4
    Sounds like a job for rotoscoping. Section 12 of the Motion 3 manual explains how to do this. It's labor intensive, because you have to keyframe the rotoshape pretty much frame by frame - but that's what is used when automated techniques (like chroma keying) don't work.

    Here's a video that shows some of the things you can do with rotoscoping:
    http://www.youtube.com/watch?v=z32h-b9-8Qw

    - Martin
     

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