[vtkusers] image scalar range problem

[liulewes]

I'm tring to create an image and assign scalars manually. I think I should get a scalar range of [1,1] for the following code,  but I get [1,52680] instead. Is it the problem of the assignment part or the GetScalarRange function or anything else?

    vtkImageData* temp = vtkImageData::New();
            temp->SetScalarTypeToUnsignedShort();
            temp->SetSpacing(1,1,0);
            temp->SetOrigin(0,0,0);
            temp->SetExtent(0,511,0,511,0,1);
            temp->SetNumberOfScalarComponents(1);
            temp->AllocateScalars();

            for (int i = 0 ; i < 512 ; ++i)
            {
                for (int j = 0 ; j < 512 ; ++j)
                {
                    *(static_cast<unsigned short*>(temp->GetScalarPointer(i,j,0))) = 1;
                }
            }

            temp->Modified();
            temp->GetPointData()->GetScalars()->Modified();
            double dtrangetemp[2];
            temp->GetScalarRange(dtrangetemp);
 		 	   		  
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