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Thread: Correcting the mess caused by the camera's auto-exposure feture

  1. #1

    Default Correcting the mess caused by the camera's auto-exposure feture

    Hi guys,

    How to use AfterEffects to correect the Mega-Annoying flicker, produced by the auto-exposure of a camera?
    I read that it is possible via the track & stabilize function but the article didn't say anything more than that.

    This is what the article says:

    AE's improved motion tracker will undoubtedly find myriad uses: to stabilize action footage shot with a long lens; level a seasick camera bobbing at sea; or remove the annoying breathing of the camera iris in footage recorded with auto-exposure. Previously, this footage often had to be discarded. But thanks to AE 6, the white point in a scene can now be tracked and continuously corrected to offset the gyrations of a camera iris attempting to render the world and everything in it as 18% gray.
    I don't really understand how is the track & stabilize function used to stabilize the flicker.
    Any help?

    Any other methods for eliminating the flicker?

    Thanks!


    PS:
    I realize that it is good to shoot with the auto-exposure turned off. It is just that my "camera" is a cheapo HD Aiptek and you can't switch to manual exposure with those.
    They don't have an exposure lock too.





    ..
    Last edited by Bulldozer; 08-06-2008 at 06:31 PM.

  2. #2
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    i didn't really understand what you're saying... but if i got it right, u should use premiere pro.
    just put the clip in the timeline, select and go to effects control window: set the anti-flicker to 1..
    The child has grown
    The dream is gone

  3. #3

    Default

    ^ I need something that removes the changes of luminosity in a video, shot with a camera with auto-exposure turned on.

  4. #4
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    the easiest way to do this, time consuming though, is to do it manually using brightness control and keyframes.
    The child has grown
    The dream is gone

  5. #5

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    Sounds like a lot of work, especially if you have to manipulate hours of footage.
    And with my almost non-existent editing skills, I am not sure about the outcome too.

  6. #6
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    okay then, here's what u should do:
    - first u should know that any "auto" effect is not trustworthy...
    - in after effects, u can use the auto levels (color correction), but it's not very good if ur video is highly contrasted, u could give it a try...
    - a better way (more time consuming for sure) is to use the color stabilizer effect (color correction): u can keep tracking ur white and black point, this is more useful than the auto stuff... but still not perfect and complicated...
    - what i think is that u really should do it manually, it won't take much work once u get used to it...
    good luck...
    The child has grown
    The dream is gone

  7. #7

    Default

    Thanks, I will try to figure out how to track the black or the white in a video.
    I believe this was the thing described in the article I quoted in my first post.
    I needed more details about how it is done.

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