[vtkusers] How to get vtkInformation of a vtkImageData object?

[Xiaoxu Wang]

Dear all,
   
    I want to call function GetAutoCroppedOutputBounds in 
vtkImageReslice. From vtk4.5 to vtk5.0, the type of this function's 
first parameter has been changed from vtkImageData to vtkInformation. It 
seems that I can use RequestInformation. But I did not find an example 
on how to use this function.  Is there any way to get the vtkInformation 
of a vtkImageData?

Thank you very much for any help in advance.
Xiaoxu