After Effects CS3  |  Go to CS4 Help

Exclude channels from blending

You can exclude one or more of a layer’s color channels from blending operations.
The Blending Options property group is only included for a layer if the layer has had a layer style added to it. To add a Blending Options property group without a layer style, add an arbitrary layer style and then immediately delete it; the Blending Options property group and its containing Layer Styles property group will remain.
  1. Expand the layer’s Blending Options property group in the Layer Styles property group in the Timeline panel.
  2. To exclude a channel from blending, set Red, Green, or Blue to Off in the Advanced Blending property group.

    You can animate these properties, so you can exclude a channel from blending at some times but include the channel at other times.


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