Java tutorial
import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JOptionPane; public class Main { public static void main(String[] args) throws IOException { BufferedImage large = ImageIO.read(new File("images/a.jpg")); BufferedImage small = ImageIO.read(new File("images/b.jpg")); int w = large.getWidth(); int h = large.getHeight(); int type = BufferedImage.TYPE_INT_RGB; BufferedImage image = new BufferedImage(w, h, type); Graphics2D g2 = image.createGraphics(); g2.drawImage(large, 0, 0, null); g2.drawImage(small, 10, 10, null); g2.dispose(); ImageIO.write(image, "jpg", new File("new.jpg")); JOptionPane.showMessageDialog(null, new ImageIcon(image), "", JOptionPane.PLAIN_MESSAGE); } }