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// For complete examples and data files, please go to https://github.com/groupdocs-viewer/GroupDocs.Viewer-for-Java
try {
	// Setup GroupDocs.Viewer config
	ViewerConfig config = Utilities.getConfiguration();

	// File guid
	String guid = fileName;
				
	// Create image handler
	ViewerImageHandler imageHandler = new ViewerImageHandler(config); 
	 
	// Set image options to show grid lines
	ImageOptions options = new ImageOptions();
	options.getCellsOptions().setShowGridLines(true);
	 
	List<PageImage> pages = imageHandler.getPages(guid, options);
	 
	for (PageImage page : pages)
	{
		System.out.printf("Page number: " + page.getPageNumber());

		// Page image stream
		Utilities.saveAsImage(page.getPageNumber() + "_" + fileName, "png", page.getStream()); 
	}
} catch (Exception exp) {
	System.out.println("Exception: " + exp.getMessage());
	exp.printStackTrace();
}