Example

package com.samurai.guicore;

import java.awt.Image;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.ImageIcon;
import java.io.File;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;


public class StartImagePanel implements PanelFactory {
    private BufferedImage imageBuf;

    public StartImagePanel(String imageFilename) throws IOException {
        imageBuf = ImageIO.read(new File(imageFilename));
    }

    @Override
    public JPanel getPanel() {
        JLabel label = new JLabel();
        Image image = new ImageIcon(imageBuf).getImage();
        Image scaledImage = image.getScaledInstance(452, 640,  java.awt.Image.SCALE_SMOOTH);

        label.setIcon(new ImageIcon(scaledImage));
        JPanel panel = new JPanel();
        panel.add(label);
        return panel;
    }
}