Creating a buffered image using Component.createImage(). : BufferedImage « 2D Graphics « Java Tutorial

1. Java Tutorial
2. 2D Graphics
3. BufferedImage

//use only if the component is visible on the screen. 
//It returns buffered images that do not support transparent pixels.

import java.awt.image.BufferedImage;

import javax.swing.JFrame;

public class Main {
  public static void main(String[] argv) throws Exception {

    JFrame f = new JFrame();
    f.setVisible(true);
    int width = 300;
    int height = 500;
    BufferedImage bimage = (BufferedImage) f.createImage(width, height);
    if (bimage == null) {
      System.out.println("component is not visible on the screen");
    }
  }
}