How to acquire black-white images from SANE scanner?
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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