In this video I show you how to do chroma key against a green screen and fine tune the settings for the best results. This video was done wit Davinci Resolve 15 but is close enough to 12 and 14 to be useful for those people still using those versions.
The Definitive Guide to DaVinci Resolve 15
https://amzn.to/2JFH3PO
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/ kerryg