Silverlight Print Antialiasing

Question

I am trying to print an image (QR code) from a Silverlight 4 application, but when printing (for example, I tried both a file with XPS files and a hardware printer), the image becomes blurry and cannot be read by a barcode reader.

Image from a printed XPS document http://img805.imageshack.us/img805/7677/qraliasing.png

I use this simple code to print it:

WriteableBitmap bitmap = new WriteableBitmap(width, height);
//write bitmap pixels
Image image = new Image(){Stretch = Stretch.None};
image.Source = bitmap;
image.Width = bitmap.PixelWidth;
image.Height = bitmap.PixelHeight;
//Print
PrintDocument printDocument = new PrintDocument();
printDocument.PrintPage += (sender, args) =>
{
    args.PageVisual = image;
};
printDocument.Print("QrCode");

Answer 1

I have found a solution.

Silverlight 4 " " , UserControl, , . 100x100 1000x1000 100x100px. , .

, ( ) .

Answer 2

, , , ...

, PrintDocument UIElement ( ), 96 DPI, 600 DPI, . , , , , - .

, blit , RenderTransform, PrintDocument , blit.

QR- ( 600/96 = 6,25 ), , :

image.RenderTransform = new ScaleTransform { 
    ScaleX = 96.0 / 600.0, 
    ScaleY = 96.0 / 600.0
};

, .

Answer 3

?

WriteableBitmap bitmap = new WriteableBitmap(width, height);
//write bitmap pixels
Image image = new Image(){Stretch = Stretch.None};
image.Source = bitmap;
image.Width = bitmap.PixelWidth;
image.Height = bitmap.PixelHeight;
//Print
PrintDocument printDocument = new PrintDocument();
printDocument.PrintPage += (sender, args) =>
{
    //**Add this**
    args.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;

    args.PageVisual = image;
};
printDocument.Print("QrCode");