You can simply apply another filter to color correct the result to get rid of the blue overcast, but i’m afraid the built in
Vegas keyer is not up to professional standards, what i use is Hitfilm Ignite Chroma Key filter, which is the best in
the industry in my opinion!
Steve Rhoden (Cow Leader)
Film Maker & VFX Artist.
Owner of Filmex Creative Media.
Samples of my Work and Company can be seen here:
https://www.facebook.com/FilmexCreativeMedia