flex 濾鏡

flex常用濾鏡：
1.GlowFilter(color, alpha, blurX, blurY, strength, quality, _inner, knockout) 發光濾鏡
2，DropShadowFilter(distance, angle, color, alpha, blurX, blurY, strength, quality, inner, knockout) 投影濾鏡
3，BlurFilter(blurX, blurY, BitmapFilterQuality.HIGH) 柔化濾鏡
4，new ColorMatrixFilter([0.3086, 0.6094, 0.0820, 0, 0,0.3086, 0.6094, 0.0820, 0, 0,0.3086, 0.6094, 0.0820, 0, 0,0, 0, 0, 1, 0])置灰濾鏡 不可用時置灰