Mauve shadows on sky scenes?

Discussion in 'Video Cameras' started by DavidM, May 18, 2006.

  1. DavidM

    DavidM Guest

    If I video a landscape type scene with sky of part blue and part
    cloud I nealy always end up with mauve "shadows" which move
    across the picture, especially if I pan the camera at all. On advice
    from my local camera shop I fitted a uv filter, but this seemed to
    make little or no difference. My cam is a JVC DVL9600.

    This mauve shadow becomes even more obtrusive once I've
    downloaded the video onto the PC for editing, and remains
    so in the final video when burnt to DVD and replayed on the
    TV.

    I'd be grateful if anyone could explain to me: a) what causes
    this mauve shadow; b) how can I avoid it in the first place; and
    c) how can I remove/reduce the effect when editing the video (I
    use Pinnacle Studio 9.4).

    Thanks for any help.
    David
     
    DavidM, May 18, 2006
    #1
    1. Advertisements

  2. DavidM

    franklin.sr Guest

    re: mauve shadows.

    I would say that it's some kind of 'image burn' issue on the ccd.

    It can happen if the camera has been either pointed into the sun or
    left on a tripod with some kind of specular highlight on one part of
    the CCD for a period of time. This 'burns' an image of that bright
    object onto the CCD and can cause a kind of ghosting of the image.

    To see if that is the case I would zoom the camera out to it's widest
    setting, set the focus to manual and then focus on it's closest setting
    and then point it up at the a uniformly clear blue sky, (with no sun in
    it) and look at the pull out the side viewfinder and slowly move the
    camera. If there are burn marks you should be able to see them.

    It happened to me, funny thing is, that it eventually went away, I
    don't know how...maybe it wasn't too bad...but it did go away.
     
    franklin.sr, Jun 7, 2006
    #2
    1. Advertisements

  3. DavidM

    franklin.sr Guest


    In regard to this, I don't use it. BUT if it is burn and it's bad it's
    going to be in the same place every time. I would try videoing a
    completely white card and downloading that into Pinnacle. Then try a
    feathered colour corrected mask for the areas with the discoloraton and
    then applied it over all your footage.

    This is obviously less than satisfactory as you would need to re-render
    ALL your footage so perhaps just use it when it's noticable..

    Good luck...
     
    franklin.sr, Jun 7, 2006
    #3
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.