Gnostice Document Studio .NET > Going Deeper > Document Engines > Working with PDF > Processing

In this section we present example code to draw a PDF page on to a raster image . Before proceeding further please make sure that the prerequisite steps as listed in the Document Engines parent topic are followed.

Given below is the sample code.

string inputFile = @"input.pdf";
float renderingDpi = 96;

using (var pdfDoc = new PDF())
{
   pdfDoc.LoadDocument(inputFile);
   var page = pdfDoc.GetPage(pageNum: 1);

   // Get page width and height in inches
   float pageWidth = page.GetWidth(MeasurementUnit.Inches);
   float pageHeight = page.GetHeight(MeasurementUnit.Inches);

   // Create a bitmap for the page and a surface from the bitmap
   var graphics = Framework.Graphics;

   // Calculate scale factor based on rendering DPI
   var systemDpi = graphics.SystemDPI;
   var scaleFactor = renderingDpi / systemDpi;

   // Convert the length unit from inches to pixels
   pageWidth *= systemDpi;
   pageHeight *= systemDpi;

   // Scale the page width and height according to the rendering DPI
   pageWidth *= scaleFactor;
   pageHeight *= scaleFactor;

   // Create a bitmap image
   using (var image = graphics.CreateImage(new Size(pageWidth, pageHeight)))
   {
      using (var surface = image.GetGraphicsSurface())
      {
         // Scale the graphics surface
         surface.CurrentGraphicsState.Scale(scaleFactor, scaleFactor);

         // Draw the page onto the graphics surface
         page.Draw(surface, renderFormFields: false);
      }

      // Set image resolution
      image.SetResolution(renderingDpi, renderingDpi);

      // Save the image to file as PNG
      image.Save(@"page_image.png", new PNGEncoderSettings());
   }
}

Draw page to a raster image

Draw page to a raster image