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Track Mattes

Thus far, you've learned to define transparent areas in a layer by using the Opacity property, alpha channels, masks, and certain layer modes and effects—all options that are part of the layer itself. Sometimes, however, you won't want to use the transparency provided by the image, or you may find that creating a mask is impractical. This is especially true if you want to use a moving image or one that lacks an alpha channel to define transparency. Whatever the case, you may want to use a separate image to define transparency. Any image used to define transparency in another image is called a matte. Because mattes use alpha-channel or luminance information to create transparency, they're usually grayscale images (or images converted into grayscale).


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