BlendMode.DIFFERENCE, BlendMode.ERASE, BlendMode.HARDLIGHT, BlendMode.INVERT
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">
<mx:Canvas width="800" height="800">
<mx:Script>
import flash.display.BlendMode;
</mx:Script>
<mx:Image id="img1" source="a.jpg"/>
<mx:Image id="img2" source="a.jpg"/>
<mx:HBox>
<mx:CheckBox id="chb" label="which one"/>
<mx:ComboBox id="cb" dataProvider="{[BlendMode.DIFFERENCE, BlendMode.ERASE, BlendMode.HARDLIGHT, BlendMode.INVERT]}"
change="chb.selected ? img1.blendMode = cb.selectedItem as String : img2.blendMode = cb.selectedItem as String"/>
</mx:HBox>
</mx:Canvas>
</mx:Application>
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