Masking, Rotoscoping, and Basic Keyframing
In Chapter 2, we discussed the creation of alpha transparency through the application of chroma key tools and custom mattes that shifted information between channels. Although these techniques are useful in many visual effects situations, there are other approaches that are commonly used. These include masking and rotoscoping. Masking is the process by which you draw or import a spline shape to define an alpha matte (Figure 3.1). Rotoscoping simply adds animation to the mask so that it changes shape over time. In addition to masks, you can animate properties in After Effects—these include ...
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