This allows you to quickly tell the STF engine whether to apply the STF to the target image or not. When hovered, this tool button shows a tool tip text that informs you about the current enabled/disabled state and how it will change if you click the button. Note that the icon shown on this button is either a green check mark to indicate the enabled state, or a red cross mark when disabled. Note also that you can enable and disable the STF for the active view by selecting Image > Screen Transfer Functions > Enable, also available from the view context menu. Finally, you can press F12 to enable or disable the STF for the active view.

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