AS3改變顯示對象亮度的其實代碼是這樣的

網上查到的基本上都是錯的，連《ActionScript 3.0 Cookbook》裡也不對，我的意思是跟Flash內容製作工具調的亮度不符，我就奇怪了，用偵錯模式測試了一個影片剪輯的亮度設定，結果就知道了

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

//value取值範圍-1~1,對應Flash內容製作工具裡的-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
}

注意上面濾鏡的備份，colorTransformer的設定會影響濾鏡設定