Brightness Свойство (Device)

Gets or sets the brightness of gray/palette/color images for current scan session.

Синтаксис

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);
}

'Declaration

Public Property Brightness As Single

Исключения

Исключение	Описание
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.

Ремарки

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.

Пример

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

VB.NET

Public Sub ScanColorImageWithBrightness(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.Brightness = 128.0F
    device.Contrast = 0

    device.Acquire()
End Sub

public void ScanColorImageWithBrightness(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.Brightness = 128f;
    device.Contrast = 0;

    device.Acquire();
}

Требования

Целевые платформы: .NET 9; .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5

Смотрите также

Справочник

Device Class
Члены типа Device

AutoBright
GetSupportedBrightnessValues
Open
Threshold

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