VintaSoft Twain .NET SDK v10.2
Halftones Property (Device)
Example 




Vintasoft.WpfTwain Namespace > Device Class : Halftones Property
Gets or sets the halftones for bit depth reduction of images for current scan session.
Syntax
'Declaration
 
Public Property Halftones As String
'Usage
 
Dim instance As Device
Dim value As String
 
instance.Halftones = value
 
value = instance.Halftones
public string Halftones {get; set;}
public: __property string* get_Halftones();
public: __property void set_Halftones( 
   string* value
);
public:
property String^ Halftones {
   String^ get();
   void set (    String^ 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 halftones can be received by the GetSupportedHalftones method.

Important: Value of the BitDepthReductionMode property must be set to the BitDepthReductionMode.Halftones value before usage of this property.
Example
This example shows how to apply halftones to images acquired from the device.
Public Sub ScanPaletteImageWithHalftones(ByVal device As Device)
    device.ShowUI = False
    device.DisableAfterAcquire = True
            
    device.Open()
    device.PixelType = PixelType.Gray
    device.BitDepthReductionMode = BitDepthReductionMode.Halftones
    device.Halftones = "Dither Pattern 1"
    device.UnitOfMeasure = UnitOfMeasure.Inches
    device.Resolution = New Resolution(200.0F, 200.0F)
            
    device.Acquire()
End Sub
public void ScanPaletteImageWithHalftones(Device device)
{
    device.ShowUI = false;
    device.DisableAfterAcquire = true;
            
    device.Open();
    device.PixelType = PixelType.Gray;
    device.BitDepthReductionMode = BitDepthReductionMode.Halftones;
    device.Halftones = "Dither Pattern 1";
    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

Reference

Device Class
Device Members
GetSupportedHalftones Method
Open Method