If we take as the uniform lightness scale Priest's approximation to the Munsell Value scale, which would be written in modern notation:: formula_7and, as the uniform chromaticity coordinates:: formula_16: formula_17where "k""e" is a tuning coefficient, we obtain the two chromatic axes:: formula_18and: formula_19which is identical to the Hunter "Lab" formulas given above if we select and .
If we take as the uniform lightness scale Priest’s approximation to the Munsell Value scale, which would be written in modern notation:formula_63and, as the uniform chromaticity coordinates:formula_74formula_75where formula_76 is a tuning coefficient, we obtain the two chromatic axes:formula_77andformula_78which is identical to the Hunter Lab formulae given above if we select formula_79 and formula_80.