Alpha Compositing

Description

This effect accepts two images as inputs and allows for a number of compositing effects to be applied on these two images.

*This is one of the most fundamental nodes in the render graph and will be widely used to combine two images into a single image.

Properties

• Blending Mode : Choose the compositing mode to compute
  Default : Source Over

• Opacity Src : Sets the opacity for the source image
  Default : 1.0

• Opacity Dst : Sets the opacity for the destination image
  Default : 1.0

Blending Modes

These correspond to the 12 standard “Porter Duff” operators that define all possible results of mixing the four regions formed by the overlapping of two graphical objects containing an alpha channel. More information here.

View all combinations

Clear		Neither source nor destination is output
Source		Only source is output
Destination		Only destination is output
Source Over		Source is over destination, both are output
Destination Over		Destination is over source, both are output
Source In		Source is output only where it overlaps destination
Destination In		Destination is output only where it overlaps source
Source Out		Source is output only where it does not overlap destination
Destination Out		Destination is output only where it does not overlap source
Source Atop		Source is output where it overlaps destination. Destination is output elsewhere
Destination Atop		Destination is output where it overlaps source. Source is output elsewhere
XOR		Source and destination are combined only where they do not overlap

Inputs

Outputs

Example

• Blending Mode : Source In
• Opactity Src : 1.0
• Opactity Dst : 1.0