Blue-Screen Matte Rotoscoping

As we covered the process of making garbage mattes in Chapter 6, "Blue-Screen Garbage Mattes," several frames required rotoscoping where the actors walked off the edge of the blue-screen tarp. From the After Effects file, we rendered out two QuickTime movies— a "pre" and "post." Those edited-out movies contain about 1 second of video that needs to be roto edited.

1. Open the movie file, BSMattePre.mov, in ImageReady and jump to Photoshop. Start with the first layer (Frame 1), and use the Paintbrush tool with a small hard-edge brush to paint in the missing blue background (Figure 7.9). You must take great care in selecting brush sizes and edge hardness/softness to blend in with the edges of the characters and around their shadows. You will notice some natural video noise along the edges of the characters; try not to remove too much of it, or it will show in the final composite.

Figure 7.9 Carefully paint in the blue background around the characters and their shadows.

2. Use the Clone Stamp tool to fill inside the shadow area that's off the matte, being careful not to create duplicate patterns or banding, because these will show up in the final video (Figure 7.10). Do not clone more area than is necessary to help minimize the changes from frame to frame.

3. Continue with each layer, checking your progress against the preceding layers and taking care not to paint in too close to the character edges.

4. When you have finished, save the file and jump to ImageReady. Export the original as a QuickTime movie with no compression so it will match the garbage matte original movie.

5. Repeat the entire process for the "post" blue-screen matte sequence, and export it as a QuickTime movie.

6. Open After Effects. Import the original garbage matte composite movie as described in Chapter 6, along with the two new QuickTime movies. Align the rotoscoped movie sequences to both ends, and render them as one complete movie to be used in composite projects (Figure 7.11).

IjaSMittePre.mov® 100K (layer 1, ECEiSJl

Figure 7.10

Use the Clone Stamp tool to fill in the missing details of the shadow areas.

Figure 7.11

Export the edited sequence as a QuickTime movie from ImageReady,and import them into After Effects to be aligned with the original garbage matte movie.

Figure 7.11

Export the edited sequence as a QuickTime movie from ImageReady,and import them into After Effects to be aligned with the original garbage matte movie.

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