VintaSoft Twain .NET SDK 15.0: Documentation for .NET developer
In This Topic
    How to acquire black-white images from SANE scanner?
    In This Topic
    If you want to acquire black-white images from SANE scanner, you should set the scan mode that allows to get black-white images.
    SDK allows to set the scan mode of SANE device using SaneLocalDevice.ScanMode property.

    SANE API does not provide standard names for scan mode, which allow to acquire black-white images from SANE scanner, and scanner vendors use different names for scan modes. For example, Canon, HP, Kodak and Samsung use "Lineart" name, Brother uses "Black & White" name, Kyocera uses "Mono" name.

    Names of supported scan modes can be obtained using SaneLocalDevice.GetSupportedScanModes method.

    Here is an example that demonstrates how to acquire black-white images from SANE device:
    /// <summary>
    /// Acquires black-white images from SANE device.
    /// </summary>
    public void AcquireBlackWhiteImageFromSaneDevice()
    {
        // create SANE device manager
        using (Vintasoft.Sane.SaneLocalDeviceManager deviceManager = new Vintasoft.Sane.SaneLocalDeviceManager())
        {
            // open SANE device manager
            deviceManager.Open();
    
            // get count of SANE devices
            int deviceCount = deviceManager.Devices.Count;
            if (deviceCount == 0)
            {
                System.Console.WriteLine("Devices are not found.");
                return;
            }
    
            // select the first SANE device
            Vintasoft.Sane.SaneLocalDevice device = deviceManager.Devices[0];
    
            // open SANE device
            device.Open();
    
    
            string blackWhiteScanMode = "Lineart";
            // get names of supported scan modes
            string[] supportedScanModes = device.GetSupportedScanModes();
            foreach (string supportedScanMode in supportedScanModes)
            {
                if (supportedScanMode == "Black & White" || supportedScanMode == "Mono")
                {
                    blackWhiteScanMode = supportedScanMode;
                    break;
                }
            }
    
            // specify that black-white images must be acquired from SANE device
            device.ScanMode = blackWhiteScanMode;
    
    
            Vintasoft.Sane.SaneAcquiredImage acquiredImage;
            do
            {
                try
                {
                    // acquire image from SANE device
                    acquiredImage = device.AcquireImageSync();
                    // if image is received
                    if (acquiredImage != null)
                    {
                        System.Console.WriteLine("Image is acquired.");
                    }
                    // if image is not received
                    else
                    {
                        System.Console.WriteLine("Scan is completed.");
                        break;
                    }
                }
                catch (System.Exception ex)
                {
                    System.Console.WriteLine(string.Format("Scan is failed: {0}", ex.Message));
                    break;
                }
            }
            // while device has more images to scan
            while (device.HasMoreImagesToScan);
    
            // close SANE device
            device.Close();
    
            // close SANE device manager
            deviceManager.Close();
        }
    
        System.Console.ReadLine();
    }
    
    ''' <summary>
    ''' Acquires black-white images from SANE device.
    ''' </summary>
    Public Sub AcquireBlackWhiteImageFromSaneDevice()
            ' create SANE device manager
            Using deviceManager As New Vintasoft.Sane.SaneLocalDeviceManager()
                    ' open SANE device manager
                    deviceManager.Open()
    
                    ' get count of SANE devices
                    Dim deviceCount As Integer = deviceManager.Devices.Count
                    If deviceCount = 0 Then
                            System.Console.WriteLine("Devices are not found.")
                            Return
                    End If
    
                    ' select the first SANE device
                    Dim device As Vintasoft.Sane.SaneLocalDevice = deviceManager.Devices(0)
    
                    ' open SANE device
                    device.Open()
    
    
                    Dim blackWhiteScanMode As String = "Lineart"
                    ' get names of supported scan modes
                    Dim supportedScanModes As String() = device.GetSupportedScanModes()
                    For Each supportedScanMode As String In supportedScanModes
                            If supportedScanMode = "Black & White" OrElse supportedScanMode = "Mono" Then
                                    blackWhiteScanMode = supportedScanMode
                                    Exit For
                            End If
                    Next
    
                    ' specify that black-white images must be acquired from SANE device
                    device.ScanMode = blackWhiteScanMode
    
    
                    Dim acquiredImage As Vintasoft.Sane.SaneAcquiredImage
                    Do
                            Try
                                    ' acquire image from SANE device
                                    acquiredImage = device.AcquireImageSync()
                                    ' if image is received
                                    If acquiredImage IsNot Nothing Then
                                            System.Console.WriteLine("Image is acquired.")
                                    Else
                                            ' if image is not received
                                            System.Console.WriteLine("Scan is completed.")
                                            Exit Try
                                    End If
                            Catch ex As System.Exception
                                    System.Console.WriteLine(String.Format("Scan is failed: {0}", ex.Message))
                                    Exit Try
                            End Try
                    ' while device has more images to scan
                    Loop While device.HasMoreImagesToScan
    
                    ' close SANE device
                    device.Close()
    
                    ' close SANE device manager
                    deviceManager.Close()
            End Using
    
            System.Console.ReadLine()
    End Sub