DropShadowFilter and Image Distortion from Ruben noise problem

I am using DistortImage from Ruben (http://www.rubenswieringa.com/blog/distortimage) applying the DropShadowFilter to an image before applying the DistortImage. The image has noise artifacts after the shadow is added. If shadow is not added, the image after distorted looks very clean. Ruben uses Shape to fill the distorted image. I then tried to add DropShadowFilter after applying the DistortImage and hope the noise would go away, but the shadow shows at the boundary of the Shape which is rectangular and not at the distorted image boundary a non-rectangular shape.
I use the draw() method to copy the distorted image in Shape to a BitmapData object. Then use the applyFilter method on the BitmapData to apply the DropShadowFilte. This is the only way I know how to transfer bitmap image from Shape to BitmapData.
Can someone please help explain why the shadow shows at the shape boundary and not the distorted image boundary?
Thanks in advance.

in safeboot happened less times than normal boot but still apear. i did disk scan and repair disk, but nothing changes. stuck pixels grow up every day, i dont know what i have to do, there is no apple store in my country, there is no proffesional on mac, and my works stacked toghether ....
please help me ...
is any free software to diagnose hardwares dedicatly? i just want to know what happend to my 2 years old iMac and am i a victim of Apple design ?
i saw many many studios that uses iMac for film and photo editing with more projects than me, some of them working 24 houres and they didnt have a problem, but mine .... bad luck

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