import org.apache.poi.hslf.HSLFSlideShow;
import org.apache.poi.hslf.model.Slide;
import org.apache.poi.hslf.usermodel.SlideShow;
import java.io.*;
class changeSlideSize{
	public static void main(String a[])
	{
		try{

SlideShow slideShow = new SlideShow(new HSLFSlideShow("slideshow.ppt"));
      java.awt.Dimension pgsize = slideShow.getPageSize();
    slideShow.setPageSize(new java.awt.Dimension(800, 600));
     FileOutputStream out = new FileOutputStream("changeSize.ppt");
    slideShow.write(out);
    out.close();
	}
	catch(Exception we){}
	}
}