Halftones Свойство (Device)

В этом разделе

Gets or sets the halftones for bit depth reduction of images for current scan session.

Синтаксис

Visual Basic
C#
Управляемые расширения для C++
C++/CLI

'Declaration

Public Property Halftones As String

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);
}

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 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.

Пример

This C#/VB.NET code shows how to apply halftones to images acquired from the device.

VB.NET


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

    device.Open()
    device.PixelType = Vintasoft.Twain.PixelType.Gray
    device.BitDepthReductionMode = Vintasoft.Twain.BitDepthReductionMode.Halftones
    device.Halftones = "Dither Pattern 1"
    device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches
    device.Resolution = New Vintasoft.Twain.Resolution(200.0F, 200.0F)

    device.Acquire()
End Sub


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

    device.Open();
    device.PixelType = Vintasoft.Twain.PixelType.Gray;
    device.BitDepthReductionMode = Vintasoft.Twain.BitDepthReductionMode.Halftones;
    device.Halftones = "Dither Pattern 1";
    device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches;
    device.Resolution = new Vintasoft.Twain.Resolution(200f, 200f);

    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

GetSupportedHalftones
Open

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