[vtkusers] How to set the resolution when I save vtkRenderWindow to jpeg?

[Helend]

I used these codes to save vtkRenderWindow to jpeg image:
    
    vtkWindowToImageFilter * w2i  = vtkWindowToImageFilter::New();
    w2i->SetInput( renWin );
    vtkJPEGWriter * image  = vtkJPEGWriter::New();
    w2i->Modified();
    image->SetInput( w2i->GetOutput());
    image->SetFileName( "aaa.jpg" );
    image->SetQuality ( 100 );
    image->Write ();

But how to set the resolution of this image?
Thank you very much!
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