Save Chart, Table and Shape on Presentation slides as Image in Java

import com.spire.presentation.ISlide;
import com.spire.presentation.Presentation;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;

public class ShapeAsImage {
    public static void main(String[] args) throws Exception {
        String inputFile = "Sample.pptx";
        String outputFile = "output/";

        //Create a Presentation instance and load sample file
        Presentation presentation = new Presentation();
        presentation.loadFromFile(inputFile);

        //Traverse every slides and every shapes on the slides
        int k = 0;
        for (int i = 0; i < presentation.getSlides().getCount(); i++) {
            ISlide slide = presentation.getSlides().get(i);
            for (int j = 0; j < slide.getShapes().getCount(); j++) {
                String fileName = outputFile + String.format("shapeToImage-%1$s.png", k);
                //Save every single shape as image
                BufferedImage image = slide.getShapes().saveAsImage(j);
                ImageIO.write(image, "PNG", new File(fileName));
                k++;
            }
        }
    }
}