'DeclarationPublic Function TwainIsGammaAvailable() As Boolean
public bool TwainIsGammaAvailable()
public function TwainIsGammaAvailable(): Boolean; 
            public function TwainIsGammaAvailable() : boolean;
            public: bool TwainIsGammaAvailable();
public: bool TwainIsGammaAvailable();
Return Value
            TRUE if support gamma correction, FALSE otherwise -> Use TwainGetLastResultCode() and
            TwainGetLastConditionCode() methods for diagnosing the error.