Since you choose colors in HSB, I'd assume that the math is done in that space as well. Empirically, the colors seem to make up tiny cubes in HSB space. If th

Since you choose colors in HSB, I'd assume that the math is done in that space as well. Empirically, the colors seem to make up tiny cubes in HSB space. If they were in RGB I don't think you'd see that kind of coherence.