How to save TWAIN acquired image(s) to a TIFF file?

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You can acquire image from TWAIN image scanner and save image as TIFF file by 2 ways:

1. Using TIFF encoder for Native or Memory transfer mode

This method works with any TWAIN image scanner.
Image is encoded using internal encoder of SDK.
Image is saved as TIFF file using the AcquiredImage.Save method.

Here is an example that demonstrates how to acquire image from TWAIN device and save image as TIFF file using TIFF encoder of SDK:

/// <summary>
/// Synchronously acquires not compressed images from TWAIN device and saves images to a multipage TIFF file.
/// </summary>
static void AcquireNotCompressedImagesFromTwainDeviceAndSaveImagesToTiffFile()
{
    // create the device manager
    using (Vintasoft.Twain.DeviceManager deviceManager = new Vintasoft.Twain.DeviceManager())
    {
        // open the device manager
        deviceManager.Open();

        // get reference to the default device
        Vintasoft.Twain.Device device = deviceManager.DefaultDevice;

        // specify that device UI must not be used
        device.ShowUI = false;

        // open the device
        device.Open();

        // specify that Memory transfer mode must be used
        device.TransferMode = Vintasoft.Twain.TransferMode.Memory;

        // acquire images from device
        Vintasoft.Twain.AcquireModalState acquireModalState;
        do
        {
            acquireModalState = device.AcquireModal();
            switch (acquireModalState)
            {
                case Vintasoft.Twain.AcquireModalState.ImageAcquired:
                    Vintasoft.Twain.ImageEncoders.TwainTiffEncoderSettings twainCodecParams =
                        new Vintasoft.Twain.ImageEncoders.TwainTiffEncoderSettings();
                    twainCodecParams.TiffCompression = Vintasoft.Twain.ImageEncoders.TwainTiffCompression.LZW;
                    twainCodecParams.TiffMultiPage = true;

                    // save acquired image to disk using TIFF encoder of SDK
                    device.AcquiredImage.Save("test.tiff", twainCodecParams);

                    // dispose the acquired image
                    device.AcquiredImage.Dispose();
                    break;
            }
        }
        while (acquireModalState != Vintasoft.Twain.AcquireModalState.None);

        // close the device
        device.Close();

        // close the device manager
        deviceManager.Close();
    }
}

VB.NET

''' <summary>
''' Synchronously acquires not compressed images from TWAIN device and saves images to a multipage TIFF file.
''' </summary>
Private Shared Sub AcquireNotCompressedImagesFromTwainDeviceAndSaveImagesToTiffFile()
    ' create the device manager
    Using deviceManager As New Vintasoft.Twain.DeviceManager()
        ' open the device manager
        deviceManager.Open()

        ' get reference to the default device
        Dim device As Vintasoft.Twain.Device = deviceManager.DefaultDevice

        ' specify that device UI must not be used
        device.ShowUI = False

        ' open the device
        device.Open()

        ' specify that Memory transfer mode must be used
        device.TransferMode = Vintasoft.Twain.TransferMode.Memory

        ' acquire images from device
        Dim acquireModalState As Vintasoft.Twain.AcquireModalState
        Do
            acquireModalState = device.AcquireModal()
            Select Case acquireModalState
                Case Vintasoft.Twain.AcquireModalState.ImageAcquired
                    Dim twainCodecParams As New Vintasoft.Twain.ImageEncoders.TwainTiffEncoderSettings()
                    twainCodecParams.TiffCompression = Vintasoft.Twain.ImageEncoders.TwainTiffCompression.LZW
                    twainCodecParams.TiffMultiPage = True

                    ' save acquired image to disk using TIFF encoder of SDK
                    device.AcquiredImage.Save("test.tiff", twainCodecParams)

                    ' dispose the acquired image
                    device.AcquiredImage.Dispose()
                    Exit Select
            End Select
        Loop While acquireModalState <> Vintasoft.Twain.AcquireModalState.None

        ' close the device
        device.Close()

        ' close the device manager
        deviceManager.Close()
    End Using
End Sub

2. Using TIFF encoder for File transfer mode

TWAIN driver must have built-in TIFF encoder - you can check this with the Device.GetSupportedImageFileFormats method.
TWAIN driver encodes acquired image and saves directly to disk.
Filename of TIFF file can be set using the Device.FileName property.

Here is an example that demonstrates how to specify that TWAIN image scanner should save acquired image directly to a TIFF file on disk:

/// <summary>
/// Starts synchronous acquisition of image from TWAIN device and specifies that acquired images must be saved directly to TIFF files on disk.
/// </summary>
static void StartSynchronousTwainScanningAndSpecifyThatImagesMustBeSavedDirectlyToTiffFiles()
{
    // create the device manager
    using (Vintasoft.Twain.DeviceManager deviceManager = new Vintasoft.Twain.DeviceManager())
    {
        // open the device manager
        deviceManager.Open();

        // get reference to the default device
        Vintasoft.Twain.Device device = deviceManager.DefaultDevice;

        // specify that device UI must not be used
        device.ShowUI = false;

        // open the device
        device.Open();

        // check if device driver can save image to disk as TIFF files
        Vintasoft.Twain.TwainImageFileFormat[] supportedImageFileFormats = device.GetSupportedImageFileFormats();
        bool isTiffFileFormatSupported = false;
        for (int i = 0; i < supportedImageFileFormats.Length; i++)
        {
            if (supportedImageFileFormats[i] == Vintasoft.Twain.TwainImageFileFormat.Tiff)
            {
                isTiffFileFormatSupported = true;
                break;
            }
        }
        //
        if (!isTiffFileFormatSupported)
        {
            // close the device
            device.Close();
            System.Windows.Forms.MessageBox.Show("Device cannot save acquired image directly to disk as TIFF image.");
            return;
        }

        // specify that File transfer mode must be used
        device.TransferMode = Vintasoft.Twain.TransferMode.File;
        // save images as JPEG files
        device.FileFormat = Vintasoft.Twain.TwainImageFileFormat.Tiff;

        int acquiredImageCount = 0;

        // acquire images from device
        Vintasoft.Twain.AcquireModalState acquireModalState;
        do
        {
            acquireModalState = device.AcquireModal();
            switch (acquireModalState)
            {
                case Vintasoft.Twain.AcquireModalState.ImageAcquiring:
                    // set the filename for image
                    device.FileName = string.Format("test{0}.tif", acquiredImageCount);
                    break;

                case Vintasoft.Twain.AcquireModalState.ImageAcquired:
                    // image is already saved to disk as TIFF file

                    // increment image count
                    acquiredImageCount = acquiredImageCount + 1;
                    break;
            }
        }
        while (acquireModalState != Vintasoft.Twain.AcquireModalState.None);

        // close the device
        device.Close();

        // close the device manager
        deviceManager.Close();
    }
}

VB.NET

''' <summary>
''' Starts synchronous acquisition of image from TWAIN device and specifies that acquired images must be saved directly to TIFF files on disk.
''' </summary>
Private Shared Sub StartSynchronousTwainScanningAndSpecifyThatImagesMustBeSavedDirectlyToTiffFiles()
    ' create the device manager
    Using deviceManager As New Vintasoft.Twain.DeviceManager()
        ' open the device manager
        deviceManager.Open()

        ' get reference to the default device
        Dim device As Vintasoft.Twain.Device = deviceManager.DefaultDevice

        ' specify that device UI must not be used
        device.ShowUI = False

        ' open the device
        device.Open()

        ' check if device driver can save image to disk as TIFF files
        Dim supportedImageFileFormats As Vintasoft.Twain.TwainImageFileFormat() = device.GetSupportedImageFileFormats()
        Dim isTiffFileFormatSupported As Boolean = False
        For i As Integer = 0 To supportedImageFileFormats.Length - 1
            If supportedImageFileFormats(i) = Vintasoft.Twain.TwainImageFileFormat.Tiff Then
                isTiffFileFormatSupported = True
                Exit For
            End If
        Next
        '
        If Not isTiffFileFormatSupported Then
            ' close the device
            device.Close()
            System.Windows.Forms.MessageBox.Show("Device cannot save acquired image directly to disk as TIFF image.")
            Return
        End If

        ' specify that File transfer mode must be used
        device.TransferMode = Vintasoft.Twain.TransferMode.File
        ' save images as JPEG files
        device.FileFormat = Vintasoft.Twain.TwainImageFileFormat.Tiff

        Dim acquiredImageCount As Integer = 0

        ' acquire images from device
        Dim acquireModalState As Vintasoft.Twain.AcquireModalState
        Do
            acquireModalState = device.AcquireModal()
            Select Case acquireModalState
                Case Vintasoft.Twain.AcquireModalState.ImageAcquiring
                    ' set the filename for image
                    device.FileName = String.Format("test{0}.tif", acquiredImageCount)
                    Exit Select

                Case Vintasoft.Twain.AcquireModalState.ImageAcquired
                    ' image is already saved to disk as TIFF file

                    ' increment image count
                    acquiredImageCount = acquiredImageCount + 1
                    Exit Select
            End Select
        Loop While acquireModalState <> Vintasoft.Twain.AcquireModalState.None

        ' close the device
        device.Close()

        ' close the device manager
        deviceManager.Close()
    End Using
End Sub

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