static fromUcs(jstar, astar, bstar) {
        return Cam16.fromUcsInViewingConditions(jstar, astar, bstar, ViewingConditions.DEFAULT);
    }
@param jstar CAM16-UCS lightness.
@param astar CAM16-UCS a dimension. Like a* in L*a*b*, it is a Cartesian
    coordinate on the Y axis.
@param bstar CAM16-UCS b dimension. Like a* in L*a*b*, it is a Cartesian
    coordinate on the X axis.