So far, I'm encouraged, but we'll have to see. The painting surface is modelled as an array of wet pixels . Each wet pixel has some pigment and a volume of water. The pigment is specified as a mixture of white and black pigments, further subdivided into the three RGB channels. This, you basically have cyan, magenta, yellow, and dichroic red, green, and blue pigments.
Dichroic red looks red when viewed reflectively, but transparent when viewed transparently.
Thus, white is a mixture of dichroic red, green, and blue. Wet Dream is soon going to become a Gimp plugin, at which point it will have file loading and saving capabilities. I'm also thinking about how to best integrate it into Gimp, but at the present Gimp has no way to store wet pixels.