[vtkusers] help:How to zoom an image

[Íõ¿­-02610]

Hi to all of you,
  
I am Wang Kai, doing my M.S. By research in Northwestern Polytechnical
University.
I am new to this VTK world. Can anyone please let me
know how to zoom an image by vtk.

I have got the corresponding imageDate of a bmp image by using vtkBMPReader and
vtkImageData, how can I zoom the image. Should I use vtkImageShiftScale? If so,
how can I use it in VC6.0? 

Will you give me a example?  
 
Your valuable suggestion will be more helpful to me.
 
Regards
Wang Kai