[vtkusers] vtk image iterator

[Zein Salah]

Hi,

I have an understanding problem, I think I am missing something.
what is a span iterator within the vtk image iterator? what is it needed
for?
I need to only iterate over an extent in the image and access data values
within it. How should I move the iterator to the next position? how to
access
the underlying data?

thx
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