Question

I’m trying to print image from Silverlight application. I have pretty good quality scans (TIFF) with resolution 1696×2200

When I print – I get PrintableArea from PrintDocument and it’s 816×1056

What I do – I resize bitmap to Printable area (to fit document to page) and result I get is blurry image. I understand this is scaling problem (most likely), but how do I scale properly so it looks good? When I display document inside Image and just set image size – it looks good.

For resizing I’m using WriteableBitmapEx extensions and tried both types of resize (Nearest neighbor and bilinear)

Code:

var printDocument = new PrintDocument(); 

            printDocument.PrintPage += (s, ea) =>
                {
                    var printableArea = ea.PrintableArea;

                    var bitmap = this.currentPreviewPage.FullBitmap.Resize((int)printableArea.Width, (int)printableArea.Height, WriteableBitmapExtensions.Interpolation.Bilinear);

                    var image = new Image { Source = bitmap };
                    var canvas = new Canvas { Width = bitmap.PixelWidth, Height = bitmap.PixelHeight };
                    canvas.Children.Add(image);

                    ea.PageVisual = canvas; 
                    ea.HasMorePages = false;
                }; 

            printDocument.PrintBitmap("Silverlight Bitmap Print");

How document looks on screen (inside Image)

And this is printed:

Answer 1

Rather than using the WriteableBitmapEx extensions, when declaring your Image element, try setting the Stretch property so that it stretches based on your maximum specified dimensions:

var image = new Image { Source = bitmap, Stretch = Stretch.UniformToFill };