[vtkusers] how to calculate the extent of an image?

[Emmanouil Moschidis]

Hello maybe it is a simple question but how can we calculate the extent of a vtkImageData? For example one 512x512 two dimensional image has extent
(0,512,0,512,0,1) ? Is it correct? In many cases i see that extent[4] is  1...   

       
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