Channel Combiner Effect; Compound Arithmetic Effect - Adobe AFTER EFFECTS 7.0 Manual

ADOBE AFTER EFFECTS 7.0
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User Guide
Specifies the blending mode used for the blending of the original layer and second layer.
Blending Mode
Ensures that the effect layer's alpha channel is not modified.
Preserve Transparency

Channel Combiner effect

The Channel Combiner effect extracts, displays, and adjusts various channels in your image.
This effect works with 8-bpc color.
Original (left); effect applied to layer created from solid with Fractal Noise effect (center); result (right)
Adjust the following controls for the Channel Combiner effect:
Specifies that the effect uses another layer to retrieve values from.
Use 2nd Layer
Specifies which layer you want to retrieve values from. This layer must be in the current composition
Source Layer
but does not need to be visible.
Specifies how you want to select values from the source layer. Saturation Multiplied specifies that the
From
saturation value (including lightness) of an image is the source. This option represents the most common view of a
pixel's saturation value. Saturation is multiplied by the minimum distance to black or white (lightness). For example,
a dark or light blue pixel has less saturation than a bright or pure blue pixel. Min RGB and Max RGB specify that the
lowest or highest value of the red, green, and blue channels of an image is the source.
Specifies where the From values are applied. Some options, such as RGB To HLS, do not use a To selection. Use
To
Red Only, Green Only, and Blue Only to view selected RGB, HLS, alpha, or luminance values in one channel without
interference from the others. When you select Hue Only, Lightness Only, or Saturation Only, the applied hue value
is combined with 50% lightness and 100% saturation; the applied lightness value is combined with 0% saturation,
which then gives the hue no effect; and the applied saturation values are combined with 0% hue and 50% lightness.
Inverts the values for the selected From and To options.
Invert
Creates an opaque alpha channel throughout the layer, replacing the original alpha channel.
Solid Alpha

Compound Arithmetic effect

The Compound Arithmetic effect mathematically combines the layer to which it is applied with another layer. The
Compound Arithmetic effect is intended only to provide compatibility with projects created in earlier versions of
After Effects that use the Compound Arithmetic effect. Using blending modes is usually more effective than using
the Compound Arithmetic effect.
This effect works with 8-bpc color.