I made my own grey and beige greenscreen colors for screenshots that work much better. Doesn’t color-bleed into the hair, like Nvidia’s uber bright blue, green, purple etc. does, making it easier. Still, took me 3 hours to get his hair clipped. Problem is, I’m super picky. Or just obstinate, or both. 😛 So three examples of this cut-out on random stuff. Still not perfect on black background but it’s tolerable/you can work with it.
The last pic is … well don’t ask. When their heads are smaller you don’t have to be as precise about the hair.