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




Vintasoft.Twain Namespace > Device Class : Brightness Property
Gets or sets the brightness of gray/palette/color images for current scan session.
Syntax
'Declaration
 
Public Property Brightness As Single
'Usage
 
Dim instance As Device
Dim value As Single
 
instance.Brightness = value
 
value = instance.Brightness
public float Brightness {get; set;}
public: __property float get_Brightness();
public: __property void set_Brightness( 
   float value
);
public:
property float Brightness {
   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 GetSupportedBrightnessValues method.

This property has effect only if you do not use User Interface (ShowUI=False).

This property has effect only for gray/palette/color images. Threshold property must be used for black-white images.
Example
This example shows how to adjust brightness/contrast and acquire color images from the device.
Public Sub ScanColorImageWithBrightness(ByVal device As Device)
    device.ShowUI = False
    device.DisableAfterAcquire = True
            
    device.Open()
    device.PixelType = PixelType.RGB
    device.UnitOfMeasure = UnitOfMeasure.Inches
    device.Resolution = New Resolution(300.0F, 300.0F)
    device.Brightness = 128.0F
    device.Contrast = 0
            
    device.Acquire()
End Sub
public void ScanColorImageWithBrightness(Device device)
{
    device.ShowUI = false;
    device.DisableAfterAcquire = true;
            
    device.Open();
    device.PixelType = PixelType.RGB;
    device.UnitOfMeasure = UnitOfMeasure.Inches;
    device.Resolution = new Resolution(300f, 300f);
    device.Brightness = 128f;
    device.Contrast = 0;
            
    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
AutoBright Property
GetSupportedBrightnessValues Method
Open Method
Threshold Property