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Java Image Watermarking
Posted on: July 24, 2010 at 12:00 AM
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In this section, you will learn how to watermark an image using java swing.

Java Image Watermarking

A watermarking is a technique that allows an individual to add copyright notices or other verification messages to digital audio, video, or image signals and documents. It  may be visible, hidden, or a combination of both. In this section, you will learn how to watermark an image using java swing.

Here is the code:

import java.io.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;
import javax.swing.ImageIcon;
import java.awt.geom.Rectangle2D;

public class ImageWatermarking {
	public static void main(String[] args) {

		try {
			File file = new File("C:/rose.jpg");
			if (!file.exists()) {
				System.out.println("File not Found");
			}
			ImageIcon icon = new ImageIcon(file.getPath());
			BufferedImage bufferedImage = new BufferedImage(
					icon.getIconWidth(), icon.getIconHeight(),
					BufferedImage.TYPE_INT_RGB);
			Graphics2D g2d = (Graphics2D) bufferedImage.getGraphics();
			g2d.drawImage(icon.getImage(), 0, 0, null);
			AlphaComposite alpha = AlphaComposite.getInstance(
					AlphaComposite.SRC_OVER, 0.5f);
			g2d.setComposite(alpha);
			g2d.setColor(Color.white);
			g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
					RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
			g2d.setFont(new Font("Arial", Font.BOLD, 30));
			String watermark = "Hello World";
			FontMetrics fontMetrics = g2d.getFontMetrics();
			Rectangle2D rect = fontMetrics.getStringBounds(watermark, g2d);
			g2d.drawString(watermark, (icon.getIconWidth() - (int) rect
					.getWidth()) / 2, (icon.getIconHeight() - (int) rect
					.getHeight()) / 2);
			g2d.dispose();
			File fileout = new File("C:/watermarkedImage.jpg");
			ImageIO.write(bufferedImage, "jpg", fileout);
		} catch (IOException ioe) {
		}
	}
}

Output:

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Posted on: July 24, 2010

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