Flex3学习轨迹：将彩色照片转换成黑白照片

通常情况下，彩色图片转换成黑白图片需要使用一定的算法来实现。在这里就使用滤镜类来实现转换。

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" fontSize="12" >
    <mx:Script>
        <![CDATA[
            private var rLum:Number = 0.2225;
            private var gLum:Number = 0.7169;
            private var bLum:Number = 0.0606;
        
            [Bindable]
            private var bwMatrix:Array = [rLum,gLum,bLum,rLum,1,0];
            
            [Bindable]
            [Embed('assets/image.jpg')]
            private var image1:Class;

        ]]>
    </mx:Script>
    <mx:ColorMatrixFilter id="cmf" matrix="{bwMatrix}" />    
    <mx:Panel title="实现将彩色图片转换为黑白色" width="360" height="240" 
        verticalAlign="middle" horizontalAlign="center">
        <mx:HBox>
            <mx:VBox>
                <mx:Label text="原始图片" />
                <mx:Image source="{image1}" />
            </mx:VBox>
            <mx:VBox>
                <mx:Label text="黑白图片" />
                <mx:Image source="{image1}" filters="{[cmf]}" />
            </mx:VBox>
       </mx:HBox>
    </mx:Panel>
</mx:Application>