withOpponentA method
Creates a new RayOklab with a different green-red opponent axis value.
Negative values tend toward green, positive values toward red. The lightness, blue-yellow axis, and opacity remain unchanged.
Implementation
RayOklab withOpponentA(double opponentA) {
return RayOklab._(l: _l, a: opponentA, b: _b, opacity: opacity);
}