AS3改变显示对象亮度的其实代码是这样的

网上查到的基本上都是错的，连《ActionScript 3.0 Cookbook》里也不对，我的意思是跟Flash内容制作工具调的亮度不符，我就奇怪了，用调试模式测试了一个影片剪辑的亮度设置，结果就知道了

import flash.display.DisplayObject
import flash.geom.ColorTransform

//value取值范围-1~1,对应Flash内容制作工具里的-100%-100%
public function setBrightness(obj:DisplayObject,value:Number):void {
    var colorTransformer:ColorTransform = obj.transform.colorTransform
    var backup_filters:* = obj.filters
    if (value >= 0) {
        colorTransformer.blueMultiplier = 1-value
        colorTransformer.redMultiplier = 1-value
        colorTransformer.greenMultiplier = 1-value
        colorTransformer.redOffset = 255*value
        colorTransformer.greenOffset = 255*value
        colorTransformer.blueOffset = 255*value
    }else {
        value=Math.abs(value)
        colorTransformer.blueMultiplier = 1-value
        colorTransformer.redMultiplier = 1-value
        colorTransformer.greenMultiplier = 1-value
        colorTransformer.redOffset = 0
        colorTransformer.greenOffset = 0
        colorTransformer.blueOffset = 0
    }
　　obj.transform.colorTransform = colorTransformer
　　obj.filters = backup_filters
}

注意上面滤镜的备份，colorTransformer的设置会影响滤镜设置