Bringing Matte Techniques Together

Once you have rotoscoped both of the sequences and converted them back into QuickTime movies, you can import them back into After Effects to complete the blue-screen footage.

Open the After Effects project with the garbage mattes (you can select the file BluescreenMatte.aep on the DVD), and import the two rotoscoped QuickTime movies (also on the DVD, titled BluescreenPreRoto.mov and BluescreenPostRoto.mov).

Place the beginning rotoscoped movie at the beginning of the Timeline, and position it to match the frames of the existing blue-screen footage. Do the same with the ending rotoscoped movie (Figure 6.12). The entire footage sequence should now be entirely clean and free of all unwanted background materials, leaving only the blue-screen background in the full frame behind the actors. Render out this movie in full scale with no compression to use in a composite movie. (We'll refer to this blue-screen movie later in the book; see Chapter 11, " Motion Matte Painting in Photoshop.") Figure 6.13 shows a sample frame.

Figure 6.12

Position the rotoscoped movies with the garbage mattes and the original blue-screen footage to create a complete full-frame blue-screen movie.

Figure 6.12

Position the rotoscoped movies with the garbage mattes and the original blue-screen footage to create a complete full-frame blue-screen movie.

Figure 6.13

Now you can use this rendered,cleaned-up blue-screen movie in your composite,with no interference or loss of image quality.

Figure 6.13

Now you can use this rendered,cleaned-up blue-screen movie in your composite,with no interference or loss of image quality.

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