Thanks Christoph,
I think that ought to give me a useful tool to more efficiently explore colors
and manually tweak my basic pigments.

I got some very interesting results with your initial formula(s) and due to
recent discussion it was immediately apparent that subtracting SB from RawColour
promoted the sampled color to a 5-term rgbft.  I corrected that and made a grid
of values with a blue color I sampled from a tabletop, and I think this gives a
good idea of the kind of variation that can occur.

#declare SampledRGB = <102, 120, 138>;
#declare SB = 0; // Saturation boost
#declare VB = 0; // Brightness ("volume") boost

#declare Rad = 0.5;

#for (SB, 0, 1, 0.1)
 #for (VB, 0, 1, 0.1)

  #declare RawColour = srgb SampledRGB/255;
  #declare SatColour = RawColour-White*SB;
  #declare MyColour  = SatColour*(1+VB)*RawColour.gray/SatColour.gray;
#debug concat( " SB = ", str(SB, 3, 3), " VB = ", str(VB, 3, 3), " ")
#debug concat( "MyColour = ", CRGBFTStr(MyColour, 3, 1), " \n")

  #declare X = SB * 10 * Rad * 3;
  #declare Y = VB * 10 * Rad * 3;
  sphere {<X, -Y, 0> Rad pigment {MyColour} }

 #end
#end

More great tools for the community from having good discussions.
Have a great weekend  :)

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