2 Replies Latest reply on Mar 9, 2008 2:41 PM by Jonas Hummelstrand

    Question on mattes

    Level 1
      Not yet a user but thinking about it. Use Premiere Pro and keep hitting things I'd like to do but can't because of program limitations.

      Question: Can AE (using mattes and or other effects) do either of the following without using a blue screen or similar:

      Remove color from a background but leave color on a subject (many colors not just one in the subject). i.e. person on street is in color but the street and everyone else is black and white.

      Remove background from subject and superimpose another background on video. i.e. person walking in corn field change background to Times Square.
        • 1. Re: Question on mattes
          Mylenium Most Valuable Participant
          Surely AE can do this kind of stuff, but, and I think here you are making wrong assumptions, not by ways of magical effects or automated matte genration. Just as you would use the simple masking tools in Premiere, most of these effects will entail lengthy masking and roto-paint procedures in AE to isolate the image regions to begin with. On occasion you may be able to bypass this tedious work by using differential info from the imagery itself (if foreground and background areas have different enough colors and you can extract a channel as a matte), but this will only be rarely the case and still require some touchup, no matter how subtle and minute.

          Mylenium
          • 2. Re: Question on mattes
            Jonas Hummelstrand Level 2
            This requires "rotoscoping" Here's a great primer by an industry guru:

            i http://effectscorner.blogspot.com/2006/01/rotoscoping-part-1.html

            i http://effectscorner.blogspot.com/2006/01/rotoscoping-part-2.html

            - Jonas Hummelstrand
            http://generalspecialist.com/