scaling in the image pipeline

[Brian Alexander Todd]

I am using vtkTkImageViewer to view an elevation map.
I want the image size to be independent of the number 
of pixels in my image data.  I can't seem to apply the
usual vtkTransform to scale the actor however.  Seems 
that this is because the image viewer uses the 2D variant
which doesn't accept vtkTransform.

The "SetSize" method for the image viewer changes only the
size of the background not the size spanned by the image
data.  Could some one tell me how to do this?

Thanks,
Brian Todd
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