Centrer des images dans un JGridPanel

Bonsoir,

Je n'arrive pas à centrer des images dans un GridPanel. Voilà mon code :
Code:
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package fr.grandmonarque.antoine.poker;
 
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
 
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
 
public class PokerMain extends JFrame {
 
    private static final long serialVersionUID = 1L;
 
    public PokerMain() throws IOException {
 
        setLayout(new GridLayout(3,1));
 
        JLabel center = new JLabel("");
 
        final BufferedImage image = ImageIO.read(new File("C:\\Users\\Utilisateur\\Downloads\\cartefm100x62.jpg"));
        JLabel icon1 = new JLabel(new ImageIcon(image));
        JLabel icon2 = new JLabel(new ImageIcon(image));
        JLabel icon3 = new JLabel(new ImageIcon(image));
        JLabel icon4 = new JLabel(new ImageIcon(image));
        JPanel north = new JPanel();
        north.add(icon1, BorderLayout.CENTER);
        north.add(icon3, BorderLayout.CENTER);
        north.setBackground(Color.blue);
        JPanel south = new JPanel();
        south.add(icon2, BorderLayout.CENTER);
        south.add(icon4, BorderLayout.CENTER);
        south.setBackground(Color.red);
 
        getContentPane().add(north, BorderLayout.CENTER);
        getContentPane().add(center);
        getContentPane().add(south, BorderLayout.CENTER);
 
        pack();
        validate();
 
        setVisible(true);
        setSize(700, 600);
        setLocationRelativeTo(null);
 
} 
 
 
    public static void main(String[] args) throws IOException {
        new PokerMain();
    }
 
}
Et voilà ce que ça donne :

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