Ok Snarly thanks for the clarification. I didn't know it affected the maths. I tried different settings and didn't notice any difference, so the effect must be subtle...I'll look closer next time. :)

 

Would I like a way to use the colors as a material color? Might be a fun thing to experiment with as a way to change a characters complexion. It does have a noticeable effect when you change those settings with "use material color" enabled. If they're  feeling sick you could even use the apple option and get a green tint

Mike