Cacher is the code snippet organizer for pro developers

// 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();
	// Create image handler
	ViewerImageHandler imageHandler = new ViewerImageHandler(config);
	String guid = fileName;

	// Options to convert 1, 3, 5, 6, 8 page numbers
	ImageOptions options = new ImageOptions();
	options.setPageNumbersToConvert(listPagesToConvert);

	List<PageImage> pages = imageHandler.getPages(guid, options);

	for (PageImage page : pages) {
		Utilities.saveAsImage(page.getPageNumber() + "_" + fileName, "png", page.getStream());
	}
} catch (Exception exp) {
	System.out.println("Exception: " + exp.getMessage());
	exp.printStackTrace();
}