Semi-Transparent Keying

I’ve been experimenting with some advanced chroma keying methods to specifically deal with reflections and subtle details like this car plate.
Often times we use keylight to get rid of everything that is green but in some cases we want to keep some of the reflections to make a shot more realistic.  Some of these tips [...]

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Source: http://www.videocopilot.net/blog/2011/09/semi-transparent-keying/