[vtkusers] VTK Screenshot save images different as the visualization in renderer window

[szx0112]

I follow the tutorial for screenshot in python: 
https://lorensen.github.io/VTKExamples/site/Python/Utilities/Screenshot/
<https://lorensen.github.io/VTKExamples/site/Python/Utilities/Screenshot/>  

This is the camera view in the renderer window
<http://vtk.1045678.n5.nabble.com/file/t342668/unnamed.png> 

The screen shot suppose to capture this camera view, however the saved png
image is a different view:
<http://vtk.1045678.n5.nabble.com/file/t342668/unnamed-2.png> 

Am I using the right method? Any comment is appreciated




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