The idea of the Zbig chroma key process is to interpret blue spill as valuable additional information for the compositing of back- and foreground.
Blue spill reflects the natural spreading of light and reflections.
Zbig perfectly replaces blue spill by simulated spill from the new background. Reflections from the new background onto foreground objects are automatically applied by the Zbig process. This is a version with an easy to use interface sold for a reasonable price. With this plugin perfect chromakeying is just one click away. Even more unbelievable possibilities to fine tune the chromakey effect for the advanced user Zbig for Avid AVX Zbig for AVX can be purchased in three editions.