Example: Porter/Duff compositing with Visual Cortex System

This topic presents an introduction to Porter/Duff compositing as achieved in a Visual Cortex System. This example builds on Example: Screen blending with Visual Cortex System. I will use the following modules along with an external video source:

  • LZX Visual Cortex
  • LZX Memory Palace
  • LZX Marble Index
  • LZX Bridge
  • LZX Arch
  • LZX Doorway

FAQ:

  • Do I need all of these modules to benefit from this thread?

No, there are a variety of ways to achieve Porter/Duff compositing. This thread hopes to assist in development of compositing comprehension and proficiency through exhibition.


  • The following diagram suggests a signal flow to facilitate Porter/Duff compositing.


SRC KEY/DST KEY

SRC KEY OVER


DST KEY OVER


SRC KEY IN


DST KEY IN


SRC KEY OUT


DST KEY OUT



SRC/DST

SRC OVER


DST OVER


SRC IN


DST IN


SRC OUT


DST OUT


SRC ATOP


DST ATOP


XOR



Porter/Duff compositing

  • Porter/Duff blend modes as achieved with Visual Cortex System are appreciated below.

  • The following sheet provides a comprehensive reference.

  • The following sheet provides a quick reference.


TLDR:

  • Keys combined with logic refine compositing control.

References:

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