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  1. How do I use alpha channels as a mask in after effects, all I've heard is something about orginal footage multiplyed by alpha channel = masked footage then masked footage + premultiplied by alpha = final composite.

    Could someone give me a step by step walkthrough on how to do this please?

    Signed Croziaq
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  2. Member
    Join Date
    Oct 2004
    Location
    Australia
    Search Comp PM
    Hi,

    I'll help you out, I've been using AE for years now.

    Assuming you have AE 6+ Professional the easiest way is to use the auto-trace feature.

    Select your layer with the alpha channel and go to Layer--? Auto trace.

    Make sure you set channel to alpha and click the Work Area check box in the timespan area.

    8)
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