function lstarFromArgb(argb) {
    const y = xyzFromArgb(argb)[1];
    return 116.0 * labF(y / 100.0) - 16.0;
}
Computes the L* value of a color in ARGB representation.

@param argb ARGB representation of a color
@return L*, from L*a*b*, coordinate of the color