VintaSoft Twain .NET SDK v10.2
Vintasoft.Twain Namespace / Device Class / Threshold Property
Example




In This Topic
    Threshold Property (Device)
    In This Topic
    Gets or sets the threshold of black-white images for current scan session.
    Syntax
    'Declaration
     
    Public Property Threshold As Single
    'Usage
     
    Dim instance As Device
    Dim value As Single
     
    instance.Threshold = value
     
    value = instance.Threshold
    public float Threshold {get; set;}
    public: __property float get_Threshold();
    public: __property void set_Threshold( 
       float value
    );
    public:
    property float Threshold {
       float get();
       void set (    float value);
    }
    Exceptions
    ExceptionDescription
    Thrown if device is in wrong state.
    Thrown if device does not support capability.
    Thrown if the .NET debugger is used and the function evaluation requires all threads to run.
    Remarks
    Call this property only when device is opened (State == DeviceState.Opened).

    Supported values of brightness can be received by the GetSupportedThresholdValues method.
    Example
    This example shows how to acquire black-white images from the device.
    Public Sub ScanBlackWhiteImageWithBitDepthReductionMode(ByVal device As Device)
        device.ShowUI = False
        device.DisableAfterAcquire = True
                
        device.Open()
        device.PixelType = PixelType.BW
        device.PixelFlavor = PixelFlavor.Chocolate
        device.BitDepthReductionMode = BitDepthReductionMode.Threshold
        device.Threshold = 128
        device.UnitOfMeasure = UnitOfMeasure.Inches
        device.Resolution = New Resolution(200.0F, 200.0F)
                
        device.Acquire()
    End Sub
    public void ScanBlackWhiteImageWithBitDepthReductionMode(Device device)
    {
        device.ShowUI = false;
        device.DisableAfterAcquire = true;
                
        device.Open();
        device.PixelType = PixelType.BW;
        device.PixelFlavor = PixelFlavor.Chocolate;
        device.BitDepthReductionMode = BitDepthReductionMode.Threshold;
        device.Threshold = 128;
        device.UnitOfMeasure = UnitOfMeasure.Inches;
        device.Resolution = new Resolution(200f, 200f);
                
        device.Acquire();
    }
    Requirements

    Target Platforms: Windows 8, Windows 7, Windows Vista, Windows XP, Windows Server 2012, Windows Server 2008, Windows Server 2003

    See Also