• Adobe After Effects

  Key what doesn’t move

  Posted by Reynaldo Cortorreal on July 31, 2009 at 3:44 am

  Ive seen plugins that key what moves, i need the opposite.

  I remember back in 99′ that i was playing a video game with a web cam. The game keyed out the background and only showed me when i moved.
  Is there a way that i can key out the background of something if the background is still?

  Im asking because i was trying to film my reflection and i didn’t have a second green screen, so i just went ahead anyways just in case that i would be able to key out the back. The camera is on a tripod and it was filming at 1080P 30fps.

  Graham Quince replied 17 years ago 2 Members · 1 Reply
• 1 Reply

• 

  Graham Quince

  July 31, 2009 at 8:18 am

  The Difference Matte effect keys out differences between a background plate and live action placed on top of it.

  The difference matte is never the easiest tool to use, but will get you started. You may find a better result using an animated mask however. it’s a bit like rotoscoping, but not quite frame by frame.

  Graham

  http://www.YouTube.com/ShiveringCactus – Free FX for amateur films

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