    source = vtkImageSinusoidSource()
    source.Update()

    normalizeFilter = vtkImageNormalize()

    normalizeFilter.SetInputConnection(source.GetOutputPort())
--
    source2 = vtkImageSinusoidSource()
    source2.SetWholeExtent(0, 255, 0, 255, 0, 0)
    source2.Update()

    # Do the sum
    sumFilter = vtkImageWeightedSum()
