    idealReal = vtkImageExtractComponents()
    idealReal.SetInputConnection(idealRfft.GetOutputPort())
    idealReal.SetComponents(0)

    butterworthHighPass = vtkImageButterworthHighPass()
    butterworthHighPass.SetInputConnection(fft.GetOutputPort())
--
    butterworthReal = vtkImageExtractComponents()
    butterworthReal.SetInputConnection(butterworthRfft.GetOutputPort())
    butterworthReal.SetComponents(0)

    # Create the actors.
    idealColor = vtkImageMapToWindowLevelColors()
--
    permute = vtkImageExtractComponents()
    permute.SetInputConnection(pad.GetOutputPort())
    permute.SetComponents(0, 2, 1)

    # Convert back into RGB values.
    rgb = vtkImageHSVToRGB()
