VintaSoftTwain Control v6.0
VintaSoftTwain Object / Device_ImagePixelType Property
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    Device_ImagePixelType Property
    In This Topic
    Gets or sets the pixel type of images for current scan session.
    Property type
    Read-write property
    Visual Basic
    Public Property Device_ImagePixelType As enumPixelType
    Return Type
    The pixel type of images for current scan session.
    Call this property after Device_Open and before Device_AcquireImage.

    You can get supported values of page sizes by Device_GetSupportedPixelTypes method.

    This property has effect only if User Interface is not used (Device_ShowUI=False).

    Information about error that occurs during getting/setting property value can be get using the Error and ErrorString properties.
    This example shows how to set pixel type and acquire images from the device.
    Private VSTwain1 As New VintaSoftTwain()
    Private Sub ScanImages()
        ' open the device manager
        If Not VSTwain1.DeviceManager_Open() Then
            Exit Sub
        End If
        ' open the device
        If Not VSTwain1.Device_Open Then
            Exit Sub
        End If
        ' scan images without UI
        VSTwain1.Device_ShowUI = False
        ' set the pixel type of acquired images
        VSTwain1.Device_ImagePixelType = PIXELTYPE.PIXELTYPE_BW
        ' subscribe to the device events
        AddHandler VSTwain1.DeviceImageAcquired, AddressOf VSTwain1_ImageAcquired
        AddHandler VSTwain1.DeviceScanCompleted, AddressOf VSTwain1_ScanCompleted
        AddHandler VSTwain1.DeviceScanFailed, AddressOf VSTwain1_ScanFailed
        AddHandler VSTwain1.DeviceScanCanceled, AddressOf VSTwain1_ScanCanceled
        ' acquire images asynchronously
    End Sub
    Private Sub VSTwain1_ImageAcquired()
        ' get index of acquired image
        Dim imageIndex As Integer = VSTwain1.AcquiredImages_Count - 1
        ' save acquired image to TIFF file
        If Not VSTwain1.AcquiredImages_Save(imageIndex, "test.tif") Then
        End If
    End Sub
    Private Sub VSTwain1_ScanCompleted()
        Console.WriteLine("Scan is completed.")
    End Sub
    Private Sub VSTwain1_ScanFailed(errorString As String)
        Console.WriteLine(String.Format("Scan is failed: {0}.", errorString))
    End Sub
    Private Sub VSTwain1_ScanCanceled()
        Console.WriteLine("Scan is canceled.")
    End Sub
    See Also