• Adobe After Effects

  color keying with poor light

  Posted by Quicksilva on September 24, 2006 at 7:35 am

  Hey guys, I’m new here so helloooo to everybody. 🙂

  I’ve unfortunately come across a problem with color keying that due to my lack of experience I’m having trouble with. I shot some footage with a crappy dv cam, not only that but I had very poor lighting where it was shot. These two matters are preventing me from keying out my background. I cannot afford to re-shoot the footage and would really like to know if there is any way better than the Keylight plugin as it needs good lighting, or garbage masks as they are tedious.
  Thanks for listening.
  QuickSilva

  Mark replied 19 years, 11 months ago 3 Members · 4 Replies
• 4 Replies

• 

  Derrick

  September 25, 2006 at 8:18 am

  Hi there,

  Post a picture or two of your footage so that we can see the extend of your possible problem to see if we can help you?

  – Derrick
• 

  Quicksilva

  September 27, 2006 at 5:34 pm

  Thanks for replying.
  Here is a link to a single frame of footage.
  https://img100.imageshack.us/my.php?image=1ra1.png
  Thanks for taking the time to look.
  Dan
• 

  Derrick

  September 28, 2006 at 5:16 am

  Hi there,

  That blue is way to dark, I’m sorry, but I don’t think there is going to be much you can do, I’ll have a look a little later today but I doubt it, I just want to see whats going on in the channels.

  How many seconds is your “blue screen” sequence?

  – Derrick
• 

  Mark

  September 30, 2006 at 2:36 am

  Here is what I would try, it may or may not work, but here goes. Duplicate your footage. On the upper most layer, add the levels filter and play around with the input white and black levels as to create as much contrast as possible. Now try and use a luma key to drop out the darker elements. Hopefully your camera doesn’t move. Next, apply the vector paint filter to this keyed layer and paint out the holes in the matte. Set the vector paint filter to show all strokes. Now use this layer as an alpha matte for the underlying layer. you may want to play around with a few pixles of blur on the matte layer, or byu using the feather in the luma key filter

  This could possibly work. It may still involve that you do some rotoscoping and the such, but there is no way that you will pull a color key from that shot (there is no color !)

  Hope this helps

  Mark

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