Get the color of a pixel on the Stage

Is there a way to retrieve the color of a generic pixel on the screen using the mouse pointer inside the Stage of Flash Player? With the getPixel method of the BitmapData class you can get the color of a pixel only if the mouse is over a bitmap image, but what if I need the color a generic pixel on the screen?

this takes a snapshot of the pixel below the mouse:
function eventHandler(event:MouseEvent):void
     var bmd:BitmapData = new BitmapData(1, 1, false, 0x000000);
     var matrix:Matrix = new Matrix();
     matrix.translate(event.stageX, event.stageY);
     //can never remember which way translate works so it could be:
     //matrix.translate(-event.stageX, -event.stageY);
     bmd.draw(stage, matrix);
     var pixelColour:uint = bmd.getPixel(0, 0);
my blog has more info: http://blog.leeburrows.com/2010/09/bitmapdata-basics-1/

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