Tweensyで色を変化させる

import com.flashdynamix.motion.Tweensy;
import com.flashdynamix.motion.TweensyGroup;
import com.flashdynamix.motion.TweensyTimeline;
import com.flashdynamix.motion.TweensySequence;
import com.flashdynamix.motion.*;
import fl.motion.easing.*;
import com.flashdynamix.motion.easing.BackEaseParams;
import com.flashdynamix.motion.easing.ElasticEaseParams;



/**
 * 色を変化させる
 * 
 * @param	e - イベント
 */
function changeColor(e:MouseEvent):void {
	var tg:TweensyGroup = new TweensyGroup();
	tg.stop(target_mc, "redOffset", "blueOffset", "greenOffset", "alphaOffset", "redMultiplier", "blueMultiplier", "greenMultiplier", "alphaMultiplier");
	tg.colorTransformTo(target_mc, new ColorTransform(0, 0, 0, 1, 256 * Math.random(), 256 * Math.random(), 256 * Math.random(), 0), 1, Quadratic.easeOut);
}

/**
 * 輝度を変化させる
 * 
 * @param	e - イベント
 */
function changeBrightness(e:MouseEvent):void {
	var tg:TweensyGroup = new TweensyGroup();
	tg.stop(target_mc, "redOffset", "blueOffset", "greenOffset", "alphaOffset", "redMultiplier", "blueMultiplier", "greenMultiplier", "alphaMultiplier");
	tg.brightnessTo(target_mc, .6, 1, Quadratic.easeOut);
}

/**
 * コントラストを変化させる
 * 
 * @param	e - イベント
 */
function changeContrast(e:MouseEvent):void {
	var tg:TweensyGroup = new TweensyGroup();
	tg.stop(target_mc, "redOffset", "blueOffset", "greenOffset", "alphaOffset", "redMultiplier", "blueMultiplier", "greenMultiplier", "alphaMultiplier");
	tg.contrastTo(target_mc, .6, 1, Quadratic.easeOut);
}

/**
 * 色を戻す
 * 
 * @param	e - イベント
 */
function defaultColor(e:MouseEvent):void {
	var tg:TweensyGroup = new TweensyGroup();
	tg.stop(target_mc, "redOffset", "blueOffset", "greenOffset", "alphaOffset", "redMultiplier", "blueMultiplier", "greenMultiplier", "alphaMultiplier");
	tg.brightnessTo(target_mc, 0, 1, Quadratic.easeOut);
}


btn1_mc.addEventListener(MouseEvent.CLICK, changeColor);
btn1_mc.buttonMode = true;

btn2_mc.addEventListener(MouseEvent.CLICK, changeBrightness);
btn2_mc.buttonMode = true;

btn3_mc.addEventListener(MouseEvent.CLICK, changeContrast);
btn3_mc.buttonMode = true;


btnReset_mc.addEventListener(MouseEvent.CLICK, defaultColor);
btnReset_mc.buttonMode = true;