[vtkusers] Disable "smoothing" of rendered image

[sandarak at wp.pl]

Hello!

I'm using vtkImageActor to view images using VTK. But the images are
automatically "smoothed" so I can't distinguish individual pixels.
I suspect that this has something to do with anti-aliasing, but as
I'm new to computer graphics I may be completely wrong about this.

Is there any method to disable this "smoothing" ?

thanks in advance

Michal Postrozny