pptx-to-jpg-customized.java

// Load the PowerPoint presentation
Presentation pres = new Presentation("presentation.pptx");

// Define dimensions
int desiredX = 1200;
int desiredY = 800;

// Get scaled values of X and Y
float ScaleX = (float)(1.0 / pres.getSlideSize().getSize().getWidth()) * desiredX;
float ScaleY = (float)(1.0 / pres.getSlideSize().getSize().getHeight()) * desiredY;

// Loop through each slide in the presentation
for (ISlide sld : pres.getSlides()) {
	
	// Create a full scale image
	BufferedImage bi = sld.getThumbnail(ScaleX, ScaleY);

	// Create a new file
	File outputfile = new File(sld.getSlideNumber() + "_Slide.jpg");
	
	// Save the image to disk in JPEG format
	ImageIO.write(bi, "jpg", outputfile);
}

pptx-to-jpg.java

// Load the PowerPoint presentation
Presentation pres = new Presentation("presentation.pptx");

// Loop through each slide in the presentation
for (ISlide sld : pres.getSlides()) {
	
	// Create a full scale image
	BufferedImage bi = sld.getThumbnail(1f, 1f);

	// Create a new file
	File outputfile = new File(sld.getSlideNumber() + "_Slide.jpg");
	
	// Save the image to disk in JPEG format
	ImageIO.write(bi, "jpg", outputfile);
}