Skip navigation

Using Luma key (white background)

1512 Views 21 Replies Latest reply: May 1, 2012 6:26 PM by filmmakersue RSS
  • Meg The Dog Level 6 Level 6 (9,370 points)
    Currently Being Moderated
    Apr 30, 2012 5:41 PM (in response to filmmakersue)

    Can you post for download (somewhere like dropbox) a 5 second clip of the material that has the hand motion that you are having trouble with - a 5 second clip of the original camera file, in the original codec, prior to your manipulating it?

    Am interested in taking a peek at the original source.

     

    Thanks

    MtD

  • filmmakersue Level 1 Level 1 (20 points)
    Currently Being Moderated
    Apr 30, 2012 6:22 PM (in response to Meg The Dog)

    yes. i can upload tomorrow and post a link. thanks.

  • filmmakersue Level 1 Level 1 (20 points)
    Currently Being Moderated
    May 1, 2012 11:35 AM (in response to filmmakersue)

    here is the link. let me know what you come up with. thanks!

     

    https://www.sendthisfile.com/SngPk1bEqWEyXiQLeUiCSHlu

  • Meg The Dog Level 6 Level 6 (9,370 points)
    Currently Being Moderated
    May 1, 2012 12:40 PM (in response to filmmakersue)

    Not trying to restate the obvious, but the shutter speed used caused frames captured with blurred motion, and that resulting smear is leaving areas of gray surrounding the quickly moving objects:

     

    test white screen Crop.png

    this makes it difficult/impossible to use the keyers to get a good looking key, as these areas are a graduation of luminance, and color.

     

    My suggestion would be to have an electronic graphics person rotoscope a matte that trims the key to the shape of the hand, most likely using After Effects. This will probably need to be done frame by frame. They will also need to manipulate the color and luminance of the fill video so that the partial transparency that reveals the white bg is darkened and colored to skin tones to help hide the repair.

     

    Ambitious, time consuming, and expensive. You should probably have a short clip (30-40 frames) rotoscoped to see if you are happy enough with the result to commit to the process.

     

    MtD

  • Meg The Dog Level 6 Level 6 (9,370 points)
    Currently Being Moderated
    May 1, 2012 1:13 PM (in response to filmmakersue)

    Or try to create a bg that helps mask the problem:

    Turning Letters.png

  • filmmakersue Level 1 Level 1 (20 points)
    Currently Being Moderated
    May 1, 2012 6:22 PM (in response to Meg The Dog)

    hey mtd-thanks for taking the time to check it out. rotoscoping not an option due to expense and i can get around it for this project by coming up with other options and bag the luma key. next time, will go green screen.

    i did like your idea about using a background that had a gradient as a temporary solution. thanks again.

  • filmmakersue Level 1 Level 1 (20 points)
    Currently Being Moderated
    May 1, 2012 6:26 PM (in response to Meg The Dog)

    ps: i would like to give you points but don't see any option to do so in the reply box.

1 2 Previous Next

Actions

More Like This

  • Retrieving data ...

Bookmarked By (0)

Legend

  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.