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try {
     // Setup GroupDocs.Viewer config
      ViewerConfig config = new ViewerConfig();
      config.setStoragePath("C:\\storage");
      // Create image or html handler
      ViewerImageHandler imageHandler = new ViewerImageHandler(config);
  
      FileInputStream fileStream = new FileInputStream("C:\\storage\\pp.pps"); 
      List<PageImage> pagesFromStream = imageHandler.getPages(fileStream);
      for (PageImage page : pagesFromStream) {
          Utilities.saveAsImage(page.getPageNumber() + "_" + fileName, "png", page.getStream());
      }
} catch (Exception exp) {
    System.out.println("Exception: " + exp.getMessage());
    exp.printStackTrace();
}