problem with ImageIcon

[jinnejeevansai]

I was trying to put a image on jpanel but i was gettong a zoomed in image.Can someone tell how to make it clear.
Actual image and screenshot of output are attached.

import javax.swing.*;
import java.awt.*;
import java.util.*;
class test1{
public static void main(String args[])
{
JFrame f = new JFrame();
f.setSize(1800,2880);
ImageIcon i = new ImageIcon("background.jpg");
JLabel l = new JLabel();
l.setIcon(i);

JPanel p = new JPanel();
p.add(l);
//JPanel p = new JPanel(new JLabel(new ImageIcon("background.jpg"))); 
f.add(p);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}