License license = new License();
license.setLicense(MyDir + "Aspose.Total.Java.lic");
Presentation pptDocument = new Presentation(MyDir + "1.pptx");
int pageCount = pptDocument.getSlides().size();
ISlide pageSlide = null;
for (int i = 0; i < pageCount; i++) {
pageSlide = pptDocument.getSlides().get_Item(0);
BufferedImage bufferedImage = pageSlide.getThumbnail(1.5f, 1.5f);
ImageIO.write(bufferedImage, "jpeg", new FileOutputStream(MyDir + "Out\\Out" + (i + 1) + "-svg.jpeg"));
}