RasterImageRenderProperties Class

public sealed class RasterImageRenderProperties 

public async void RasterImageRenderPropertiesExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = @"Assets\Ocr1.tif";
   string[] destFileNames = 
   {
      @"Ocr1_Normal.png",
      @"Ocr1_ScaleToGrary.png"
   };

   // Load the source image
   RasterImage srcRasterImage;
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   ILeadStream loadStream = LeadStreamFactory.Create(loadFile);
   using (IDisposable leadStreamDisposable = loadStream as IDisposable)
   {
      srcRasterImage = await codecs.LoadAsync(loadStream);
   }

   // Create writeable bitmaps that fit inside 300 by 300 pixels keeping the image aspect ratio
   LeadRect destRect = LeadRectHelper.Create(0, 0, 300, 300);
   destRect = RasterImage.CalculatePaintModeRectangle(
      srcRasterImage.ImageWidth,
      srcRasterImage.ImageHeight,
      destRect,
      RasterPaintSizeMode.Fit,
      RasterPaintAlignMode.Near,
      RasterPaintAlignMode.Near);

   // Create the writeable bitmaps
   for (int i = 0; i < 2; i++)
   {
      WriteableBitmap bitmap = new WriteableBitmap(destRect.Width, destRect.Height);

      // Create a RasterRenderBuffer object for the bitmap
      RasterRenderBuffer renderBuffer = RasterRenderBuffer.CreateFromWriteableBitmap(bitmap.PixelWidth, bitmap.PixelHeight, bitmap.PixelBuffer);

      // Render the image into the buffer using scale to gray and without
      RasterImageRenderProperties properties = new RasterImageRenderProperties();

      if (i == 0)
         properties.RenderDisplayMode = RasterImageRenderDisplayModeFlags.None;
      else
         properties.RenderDisplayMode = RasterImageRenderDisplayModeFlags.ScaleToGray;

      RasterImageRenderer.Render(srcRasterImage, renderBuffer, destRect, properties);
      bitmap.Invalidate();

      // Save the image using LEAD as PNG
      using (RasterImage saveImage = RasterImageConverter.ConvertFromImageSource(bitmap, ConvertFromImageOptions.None))
      {
         StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileNames[i], CreationCollisionOption.ReplaceExisting);
         ILeadStream saveStream = LeadStreamFactory.Create(saveFile);
         using (IDisposable leadStreamDisposable = saveStream as IDisposable)
         {
            await codecs.SaveAsync(saveImage, saveStream, RasterImageFormat.Png, 32);
         }
      }
   }

   // Clean up
   srcRasterImage.Dispose();
   codecs.Dispose();
}