Uhoh... caught out!
There's a note on my whiteboard - do REAL colour mixing...
ArtRage uses the standard digital model for blending colours - it's sort of an interpolation between the colours - sort of additive, sort of averaging. If you mix red with blue you get a lighter purple.
In the Real World, pigments mix in a very complex manner. There is a subtractive component - where adding blue to red gives a deep dark purple. Most rich colours when you mix them end up looking like grey-brown mud. But the subtractive component varies according to the amount of thinner in the mix as well.
So for the moment we're stuck with the standard digital colour blending model. We're definitely going to look at other models down the line. Throw away your colour-blending wheel if you're using ArtRage - we dont use that model I'm afraid.
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"