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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 premultiplied alpha. When you import a file containing an alpha channel, After Effects tries to detect a label indicating whether the alpha is straight or premultiplied. If the alpha is unlabeled, After Effects prompts you with an Interpret Footage Dialog box in which you manually select how to interpret the alpha. You may choose to ignore the alpha, interpret it as straight, premultiplied with black, premultiplied with white, or allow After Effects to guess the type of alpha.

If you know how you want to interpret the alpha of the footage you import, you can select a default interpretation. You can also change the interpretation of a footage file after you import it.


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