Convert ppt to png using Apache poi

Question

Hello, I am trying to use the Apache Poi framework to convert each ppt slide to a separate png. The problem is that some slides are deformed. For example, there is a slide where the background has a rainbow color. Images that are on some slides do not appear in the .png file at all

here is the code:

        FileInputStream is = new FileInputStream(args[0]);

        SlideShow ppt = new SlideShow(is);


        is.close();

        Dimension pgsize = ppt.getPageSize();

        Slide[] slide = ppt.getSlides();

        for (int i = 0; i < slide.length; i++) {

        BufferedImage img = new BufferedImage(pgsize.width, pgsize.height,
        BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = img.createGraphics();
        //clear the drawing area
        graphics.setPaint(Color.white);
        graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));

        //render
        slide[i].draw(graphics);

        //save the output
        FileOutputStream out = new FileOutputStream("C:\\Users\\Farzad\\Desktop\\slide-" + (i+1) + ".png");
        javax.imageio.ImageIO.write(img, "png", out);
        out.close();
        }

Answer 1

For this we do not need to use:

graphics.setPaint(Color.white);

Use instead:

graphics.setPaint(
    slideShow.getSlides()[0].getBackground().getFill().getForegroundColor()
);