Exclude channels from blending

You can exclude one or more of the color channels of a layer 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 remain.

Expand the Blending Options property group for the layer in the Layer Styles property group in the Timeline panel.
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.