Java tutorial
import java.awt.AlphaComposite; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.net.URL; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; public class Main { public static void main(String[] args) throws IOException { URL url = new URL("http://www.java2s.com/style/download.png"); BufferedImage im = ImageIO.read(url); URL url2 = new URL("http://www.java2s.com/style/download.png"); BufferedImage im2 = ImageIO.read(url2); Graphics2D g = im.createGraphics(); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.4f)); g.drawImage(im2, (im.getWidth() - im2.getWidth()) / 2, (im.getHeight() - im2.getHeight()) / 2, null); g.dispose(); display(im); ImageIO.write(im, "jpeg", new File("output.jpeg")); } public static void display(BufferedImage image) { JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.getContentPane().add(new JLabel(new ImageIcon(image))); f.pack(); f.setVisible(true); } }