The Buffer property works as the input and output buffer containing the image data to save. If the value of CodecsSaveOptions.RetrieveDataFromImage is set to false (the default), then the user is always responsible for providing the image data by setting in Buffer. If the value of CodecsSaveOptions.RetrieveDataFromImage is set to true, then the RasterCodecs object will populate the Buffer prior to raising this event. The user can then inspect or modify the scanlines data or simple ignore it to save the original image data as is.

Notice that on either case, the user must provide the scanline data in the source image original format (stored in the Image property. The RasterCodecs object will then convert this data to the appropriate output format if needed, for example, if the user instructed the RasterCodecs object to save the image in a different file format than the original image.

This event can also be used to provide feedback to the user on the save operation progression and a chance for cancellation. To understand the various page and percentages, consider the following example.

File Ocr.tif is a multi-page TIF file containing 4 pages. We want to save pages 2 through 4 (a total of 3 pages). We make the following call:

             private void Test(RasterCodecs rasterCodecsObject)
             {
                // Load the image
                RasterImage image = rasterCodecsObject.Load(@"C:\Users\Public\Documents\LEADTOOLS Images\Ocr.tif");
            
                // Tell the RasterCodecs object to automatically set the image data to save from the source image
                rasterCodecsObject.Options.Save.RetrieveDataFromImage = true;
            
                // Subscribe to the SaveImage event
                rasterCodecsObject.SaveImage += new EventHandler<CodecsSaveImageEventArgs>(rasterCodecsObject_SaveImage);
            
                // Save pages 2 through 4 (total of 3 pages)
                int firstImagePage = 2;
                int lastImagePage = 4;
                int firstFilePage = 1;
            
                // Save
                rasterCodecsObject.Save(
                   image,
                   @"C:\Users\Public\Documents\LEADTOOLS Images\Ocr_pages2through4.tif",
                   RasterImageFormat.Tif,
                   1,
                   firstImagePage,
                   lastImagePage,
                   firstFilePage,
                   CodecsSavePageMode.Overwrite);
            
                // Unsubscribe to the LoadImage event
                rasterCodecsObject.SaveImage -= new EventHandler<CodecsSaveImageEventArgs>(rasterCodecsObject_SaveImage);
            
                image.Dispose();
             }
            
             private void rasterCodecsObject_SaveImage(object sender, CodecsSaveImageEventArgs e)
             {
             }
             

Inside the event handler, we will have the following values:

System.Object
   System.EventArgs
      Leadtools.Codecs.CodecsSaveImageEventArgs

Target Platforms: Silverlight, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

Reference