[vtkusers] how to get the get the currently displayed image

[José M. Rodriguez Bacallao]

hi folks, I need to get the currently displayed image and save it to a
dicom file and I don't want to user vtkWindowToImageFilter, the problem
with this filter is that it only save one slice (including annotations) and
I need to save all slices in the current orientation. My orientations are
set using the camera view up, this is an example pipeline:

vtkGDCMImageReader -> vtkImageChangeInformation -> vtkImageReslice ->
vtkImageSlice -> vtkRenderer -> vtkRenderWindow

I am using python by the way.
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