    wlut = vtkWindowLevelLookupTable()
    wlut.SetWindow(colorWindow)
    wlut.SetLevel(colorLevel)
    wlut.Build()

    # Map the image through the lookup table.
--
    wllut = vtkWindowLevelLookupTable()
    wllut.SetWindow(255)
    wllut.SetLevel(128)
    wllut.SetTableRange(0, 255)
    wllut.Build()

