    s = ['', f'vtkNew<vtkDiscretizableColorTransferFunction> GetCTF()', '{', comment,
         f'{indent}vtkNew<vtkDiscretizableColorTransferFunction> ctf;', '']

    interp_space = parameters['color_map_details'].get('interpolationspace', None)
    if interp_space:
        interp_space = interp_space.lower()
--
    s = ['', f'vtkNew<vtkDiscretizableColorTransferFunction> GetCTF()', '{', comment,
         f'{indent}vtkNew<vtkDiscretizableColorTransferFunction> ctf;', '']

    interp_space = parameters['color_map_details'].get('interpolationspace', None)
    if interp_space:
        interp_space = interp_space.lower()
