So now our gray-skinned but red-blooded head looks kind-of correct. Humans are not gray skinned though. Let's fix the diffuse color with - a diffuse color map. We'll keep the attenuation values as is for the moment. Let's see what we get.

OMG! There is WAY more scatter now, and it's way more red than before.

OMG! OMG! That was totally unexpected right? Or is it?

On this node, there is no place to modulate the AMOUNT or COLOR of the scatter - just the attenuation. It's not unreasonable to suppose that the programmer (Stefan) wired up the Color input to both the internal Scatter and the internal Diffuse.

I say again - the Color input is going to modulate both the diffuse reflections AND the scattered light. They are not isolated. They cannot be modulated INDEPENDENTLY.

If you plan to use a diffuse color MAP and a scatter color MAP, you cannot use this node. They are not separate inputs. They cannot separately be modulated by independent sources.

If that's what you're trying to do, use separate, independent color maps, one for scatter COLOR(amount) and one for diffuse COLOR(amount) then stop right now.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)