2 Replies Latest reply on May 21, 2012 1:36 AM by Karel Bata

    combining the alpha channels?

    Karel Bata Level 1

      I'm missing something really obvious here, but what is it?


      I want to have a subject casting shadows on a moving clouds background. Here's the clip so far using a method that doesn't works quite well enough :



      The shadow doesn't work on the darker parts of the cloud. That's not really so much of a prob in 2D, but this is a stereo 3D project and having the shadow intermittently disappear looks odd.


      So, to create a shadow that I can then insert between the two Images, I need to combine the alpha channels from the two videos (one created using green as a key, the other the blue sky).


      How do I do that? I bet it's really obvious!


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      Currently using CS5