code: public GenericColor lighten(ColorFactor factor) {
  
      return valueOf(this.red.increase(factor), this.green.increase(factor), this.blue.increase(factor), this.alpha);
    }
docs: Lightens this color by the given {@code factor}.
  
  @param factor is the factor to increase by. E.g. {@code 0.0} will cause no change, while {@code 1.0} will return
  {@link Color#WHITE white}.
  @return a new color lighter by the given {@code factor}.