Create a grayscale image with Java 2D tools

  


import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class GrayImage extends JPanel {
  public GrayImage() {
  }

  public void paint(Graphics g) {
    Image myImage = new ImageIcon("yourImage.png").getImage();
    BufferedImage bufferedImage = new BufferedImage(myImage.getHeight(this), myImage.getWidth(this), BufferedImage.TYPE_BYTE_GRAY);

    Graphics gi = bufferedImage.getGraphics();
    gi.drawImage(myImage, 0, 0, null);
    gi.dispose();
    
    Graphics2D g2d = (Graphics2D) g;
    g2d.drawImage(bufferedImage, null, 0, 0);
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.add(new GrayImage());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400,400);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}

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Create a grayscale image with Java 2D tools : Image « Advanced Graphics « Java

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