LuminosityMaskShader  - AS3 Flex

<?xml version="1.0" encoding="utf-8"?>
<!-- LuminosityMaskShader.mxml -->
<s:Application name="LuminosityMaskShader"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark">
    
    <fx:Script>
    <![CDATA[
    
         //function to set mask and maskType
         private function setMask(): void
         {
             group2.mask = rectMask;
             group2.maskType = "luminosity";
         }
    ]]>
    </fx:Script>
    
    <fx:Declarations>
        <s:Group id="rectMask" blendMode="normal" x="10"  y="20">
        <s:Ellipse width="170" height="220">
            <s:fill>
                <s:SolidColor color="0x33CC99" />
            </s:fill>
        </s:Ellipse>
        </s:Group> 
    </fx:Declarations>
    
    <s:Panel title="LuminosityMaskShader Example"
            width="75%" height="75%"
            horizontalCenter="0" verticalCenter="0">

        <s:Group id="group2" horizontalCenter="0" y="10">
        <s:BitmapImage source="@Embed('/assets/ks5792.jpg')" />
        </s:Group>
        <s:Button label="Apply Luminosity mask" click="setMask()" 
            x="15" y="265" />
    </s:Panel>

</s:Application>