[vtkusers] Composite two dataset?

[wang minyou]

Hi all, 

Sorry, I have send this question ever, but no reponse. I'm sorry to bother 
you, but I really need help.
I'm using vtkImageGradient to get LinkEdges of a image, now I want to 
composite the LinkEdges and the original image into one image. 
Anyone knows how to do that? Or could give me a direction? 
Any help will be greatly appretiated. 

Thanks in advance 

Wang

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