fromUcs static method
Create a CAM16 color from CAM16-UCS coordinates jstar, astar, bstar.
assuming the color was viewed in default viewing conditions.
Implementation
static Cam16 fromUcs(double jstar, double astar, double bstar) {
  return fromUcsInViewingConditions(
    jstar,
    astar,
    bstar,
    ViewingConditions.standard,
  );
}