[vtkusers] help:How to zoom 2D Image?

[Cao,Guogang]

how to zoom 2D Image?
Is vtkCamera for 3D rendering?

this my code:

//read the 16bits Data
vtkVolume16Reader *v16 = vtkVolume16Reader::New();  
v16->SetDataDimensions (512,512);
v16->SetImageRange (1,1);
v16->SetDataByteOrderToLittleEndian();
v16->SetFilePrefix (chFilePre);

//create an imageView and render the image
vtkImageViewer *pview = vtkImageViewer::New();
pview->SetInput(v16->GetOutput());
pview->SetZSlice(1);
pview->SetSize(512,512);
pview->Render();

But how to Zoom it?