AutoBright Property (Device)

In This Topic

Determines that brightness should be automatically detected.

Syntax

'Declaration

Public Property AutoBright As Boolean

public bool AutoBright { get; set; }

public: __property bool get_AutoBright();
public: __property void set_AutoBright(
   bool value
);

public:
property bool AutoBright {
   bool get();
   void set(bool value);
}

Exceptions

Exception	Description
TwainInvalidStateException	Thrown if device is in wrong state.
TwainDeviceCapabilityException	Thrown if device does not support capability.
DebuggerException	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).

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 C#/VB.NET code shows how to adjust brightness/contrast and acquire color images from the device.

VB.NET


Public Sub ScanColorImageWithAutoBright(device As Vintasoft.Twain.Device)
    device.ShowUI = False
    device.DisableAfterAcquire = True

    device.Open()
    device.PixelType = Vintasoft.Twain.PixelType.RGB
    device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches
    device.Resolution = New Vintasoft.Twain.Resolution(300.0F, 300.0F)
    device.AutoBright = True
    device.Contrast = 0

    device.Acquire()
End Sub


public void ScanColorImageWithAutoBright(Vintasoft.Twain.Device device)
{
    device.ShowUI = false;
    device.DisableAfterAcquire = true;

    device.Open();
    device.PixelType = Vintasoft.Twain.PixelType.RGB;
    device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches;
    device.Resolution = new Vintasoft.Twain.Resolution(300f, 300f);
    device.AutoBright = true;
    device.Contrast = 0;

    device.Acquire();
}

Requirements

Target Platforms: .NET 10; .NET 9; .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5

Reference

Device Class
Device Members

Brightness
GetSupportedBrightnessValues
Open
Threshold

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