[vtkusers] getPixelData

[Hoang Hoang]

I am using 3d Slicer and I want to get the capture directly the image from a
window (not via vtkWindowToImageFilter) . I am trying GetPixelData but it
does not work, any advise?
 by the way , I want to change some pixels of a vtkrenderwindow object too,
could any one help me?
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