poor image quality when saving scanned pages as bitonal TIFF

There's got to be a dither setting I'm missing, but the bitonalization applied when saving out printed pages with the code below looks terrible. What can I do to improve the quality of the image after it's been bitonalized?

#region print event handling

int currentPageNumber = 0;
Leadtools.RasterImage currentImage = null;

void printer_JobEvent(object sender, Leadtools.Printer.JobEventArgs e)
{
if (e.JobEventState == Leadtools.Printer.EventState.JobStart) {
this.currentPageNumber = 0;
}
else if (e.JobEventState == Leadtools.Printer.EventState.JobEnd) {
// save the file to disk
string filename = Path.GetTempFileName();
codecs.Save(currentImage, filename, Leadtools.RasterImageFormat.CcittGroup4, 1);
currentImage.Dispose();

// pass the image off to the DTI application itself
LaunchImageIntoDTI(filename);

return;
}
}

void printer_EmfEvent(object sender, Leadtools.Printer.EmfEventArgs e)
{
Leadtools.RasterImage newPage;

using (var mf = new System.Drawing.Imaging.Metafile(e.Stream)) {
int targetDpi = 200;

double sourceWidthInInches = Math.Round(mf.Width / mf.HorizontalResolution, 2);
double sourceHeightInInches = Math.Round(mf.Height / mf.VerticalResolution, 2);

int destWidthInPixels = (int)Math.Round(sourceWidthInInches * targetDpi);
int destHeightInPixels = (int)Math.Round(sourceHeightInInches * targetDpi);

using (Bitmap bmp = new Bitmap(destWidthInPixels, destHeightInPixels)) {
bmp.SetResolution(targetDpi, targetDpi);

using (Graphics g = Graphics.FromImage(bmp)) {
g.Clear(System.Drawing.Color.White);
g.DrawImage(mf, 0, 0, bmp.Width, bmp.Height);
}

newPage = Leadtools.Drawing.RasterImageConverter.ConvertFromImage(
bmp, Leadtools.Drawing.ConvertFromImageOptions.None);
}
}

if (++currentPageNumber == 1)
currentImage = newPage;
else
currentImage.AddPage(newPage);
}

#endregion

If you save a colored image as 1-bit, the default behavior is used and you will not be able to control it.
If you use the Leadtools.ImageProcessing.ColorResolutionCommand Class to convert from any bits-per-pixel to any bits-per-pixel, you will be able to control dithering options including 'None' mode.

Which dither method would you recommend for best results with text?

You can check the ColorResolutionCommand from the pre-built C# demo shipped with our toolkit and try the Color => Transform => Color Resolution and try the different dithering methods. But for text, you might get good results when setting dithering to 'none'.