[vtkusers] how to set the values of the SetDataExten t of the funtion SetDataExtent

[邵世锋]

Hi,
Can you tell me how to set the frontal four parameters in SetDataExtent(0,122,0,127,1,15) of the vtkImageReader,just like how set the (0,122,0127),how do I know the values from the bmp files.Thank you very much. 
 
 
 
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