Contents

Matte

A merge operation that layers premultiplied foreground over background.

Parameter Types

Parameter descriptions

Foreground

The color4 foreground input. F represents the RGB component of this parameter. f represents the alpha component of this parameter.

Background

The color4 background input. B represents the RGB component of this parameter. brepresents the alpha component of this parameter.

Mix

The weight of the blend operation. The higher the value of Mix, the more apparent the effect of the blend operation. The default value is 1. Values outside of the range 0-1 produce an undefined effect outside of the node’s intended function.

Discussion

The Matte node determines its output using the alpha channels of the foreground and background inputs. The RGB component of the output is Ff+B(1-f) and the alpha component of the output is f+b(1-f). Below is a simple node graph that uses the In node to blend a wood and rock texture.

[Image]

Below are the two original images, the image representation of the alpha of the foreground, and the resulting blended texture applied to a cube.

[Image]

See Also

Nodes