public static SimpleColor Blend(SimpleColor a, SimpleColor b)
{
int rval, gval, bval;
double aval;
rval = RGBClamp((int)(a.GetA() * (a.GetR() - b.GetR()) + b.GetR()));
gval = RGBClamp((int)(a.GetA() * (a.GetG() - b.GetG()) + b.GetG()));
bval = RGBClamp((int)(a.GetA() * (a.GetB() - b.GetB()) + b.GetB()));
aval = a.GetA() + b.GetA() * (1 - a.GetA());
return(new SimpleColor(rval, gval, bval, aval));
}