Composite Color Icon


A node to composite two RGBA inputs using Porter-Duff [Porter:1984:CDI:800031.808606] compositing operators.


Color Parameters

Source Color
The source color.
Source Alpha
The source alpha channel.
Destination Color
The destination color.
Destination Alpha
The destination alpha channel.
Composite Mode

The composite operator [1] to use. It can take the following values

  • Source
  • Destination
  • Over
  • Under
  • In
  • Mask
  • Out
  • Stencil
  • Atop
  • Dst-Atop
  • Xor
  • Matte

See also

Merging and Transformation of Raster Images for Cartoon Animation [Wallace:1981:MTR:965161.806813] and the webpage for a detailed view on compositing algebra in general.

Clamp Output
Checking this checkbox will clamp the output into the [0,1] range.


Output Color
The composited color.
Output Alpha
The alpha with the result of the compositing operation.


[1]The original Porter-Duff paper (PDF file) can be found here.


[PD84]Thomas Porter and Tom Duff. Compositing digital images. In Proceedings of the 11th Annual Conference on Computer Graphics and Interactive Techniques, SIGGRAPH ‘84, 253–259. New York, NY, USA, 1984. ACM. URL:, doi:10.1145/800031.808606.
[Wal81]Bruce A. Wallace. Merging and transformation of raster images for cartoon animation. SIGGRAPH Comput. Graph., 15(3):253–262, August 1981. URL:, doi:10.1145/965161.806813.