IMPORTANT INFO HERE! We do a lot of artists the request the chroma key background, I think because they import into video software that has chroma key features. With that being said, if you are just doing photo work, you will avoid many extra steps if you shoot subject on a Light Gray Seamless Background. Keeping it neutral will eliminate the color cast spillover into the subject area.
GREEN SCREEN SERIES--VIDEO #1 This tutorial will show you how to mask a subject on a Green Screen.