Ben Rollason posted new After Effects tutorial videos on Creative Cow: Lens Flare in AE and Premultiplication Explained and Subtract and Divide Blending Modes in AE CS4:
"Ben suggests that now that people are creating new CS5 projects with built-in subtract and divide blending modes, there may be a call to 'retrofit' these options to earlier versions. [He also explains] how compositing applications create a composite" so you can control premultiplication and predivison manually if needed.
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