[vtkusers] Set Different Opacity Value to Different GrayScale to DisplayImage

[Hongsongyang]

Dear All:
    Currently, we can set different opacity value to different actors.
However, if we only display one gray scale image. Could we set different 
opacity value to different Gray scale pixel points? If it is possible, 
some useless points in a image will not be shown or in transparent state.
 
(Color Image is the same problem, whether we could set different opacity
value to different RGB pixel points).
 
Thanks a lot.
 
Best regards.
Hong Songyang 
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