MARKUS

        public System.Drawing.Image Exporting(Visual visual,double pageWidth,double pageHeight)

        {

            BitmapEncoder encoder = new PngBitmapEncoder();

            RenderTargetBitmap renderBitmap = new RenderTargetBitmap((int)pageWidth, (int)pageHeight, 96d, 96d, PixelFormats.Default);

            DrawingVisual drawingVisual = new DrawingVisual();

            using (DrawingContext drawingContext = drawingVisual.RenderOpen())

            {

                VisualBrush visualBrush = new VisualBrush(visual);

                drawingContext.DrawRectangle(visualBrush, null, new System.Windows.Rect(new System.Windows.Point(0,0), new System.Windows.Point(pageWidth, pageHeight)));

            }

            renderBitmap.Render(drawingVisual);

            MemoryStream mystream = new MemoryStream();

            encoder.Frames.Add(BitmapFrame.Create(renderBitmap));

            encoder.Save(mystream);

            System.Drawing.Image myImage;

            myImage = System.Drawing.Image.FromStream(mystream);

            //using (Graphics gr = Graphics.FromImage(Resultimg))

            //{

            //    //Graphics 객체에 Image 를 그릴때 Rectangle x,y 값을 추가 입력  

            //    gr.DrawImage(myImage, new Rectangle(0,0,img.Width,img.Height));

            //}

            //image = RasterImageConverter.ConvertFromImage(Resultimg, ConvertFromImageOptions.None);

            return myImage;

        }

        public System.Drawing.Image Exporting_old(Canvas canvas, System.Drawing.Image img)

                gr.DrawImage(myImage, new Rectangle(0, 0, img.Width, img.Height));