    fft = vtkImageFFT()
    fft.SetInputConnection(reader.GetOutputPort())

    idealHighPass = vtkImageIdealHighPass()
    idealHighPass.SetInputConnection(fft.GetOutputPort())
    idealHighPass.SetXCutOff(0.1)
--
    fft = vtkImageFFT()
    fft.SetInputConnection(reader.GetOutputPort())

    mag = vtkImageMagnitude()
    mag.SetInputConnection(fft.GetOutputPort())

