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