How can I achieve transparent out-of-range component 1 in 2 components image data?

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I have a vtkImageData with 2 components, and use volume mapper into a vtkVolume with
volumeProperty->IndependentComponentsOff()
my first component is with color transfer function, and second component is with opacity transfer function,

now I want that only a range of the first component is visible, others (above or below the range) is fully transparent, and the visible part is still affected by the second component’s opacity transfer function. How can I achieve this?