[vtkusers] I have a 2 components' image, How do I view them?

[Mark Jefferson]

Hi, vtkusers,
  I have a 2 components' image, a .vti data. and I want to view the two components using vtkImageViewer2, because the 2 components are 2 different CT image. but I find there is the same image (the first image) shown in the vtkImageViewer2's render window when I render them using two objects of vtkImageViewer2.
  I have used SetSlice() of vtkImageViewer2 to choose the render image's slice, and I also used vtkImageMapToWindowLevelColors to choose the different components. but they all don't work.
  could anyone give me a suggestion if I want to view them? thank you for your help!
  M. J.
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