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Chapter 2. Importing Footage into a Proj... > Importing Files with Alpha Channels

Importing Files with Alpha Channels

A file containing an alpha channel can be saved in two ways: as straight alpha or as premultiplied alpha. When you import a file containing an alpha channel, After Effects tries to detect a label (encoded in the file) that indicates whether the alpha is straight or premultiplied. If the alpha is unlabeled, After Effects prompts you with an Interpret Footage dialog box where you manually select how to interpret the alpha. You may ignore the alpha; interpret it as straight, premultiplied with black, or premultiplied with white; or allow After Effects to guess the type of alpha.


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