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Chapter 7. Getting Creative with Keys > Using Animated Mattes to Track the Key

Using Animated Mattes to Track the Key

As soon as you get a feel for how still matte keys work, you can move on to more exciting matte key features, such as animated matte keys. The basic idea is that you can change the matte's shape and/or position over time. In the previous example, the image you focused on was static (not moving). What happens if you want to use that same effect with an image that is moving? This process is much more involved. Depending on what you are trying to highlight, there are several ways to approach this type of effect.

One situation might involve images or objects you created in a third-party animation program (see Figure 7.19). The matte can be automatically generated by the animation software. This saves you a tremendous amount of time. If the image you want to highlight was not created in an animation program or shot against a blue screen, you might have to export every frame and paint each one individually to get the exact matte shape for each frame. This process is very time-consuming, but you can create some exciting effects.


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