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About Byron Kiourtzoglou

Byron Kiourtzoglou
Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Java: Create BufferedImage from Image example

In this tutorial we are going to show you how to create a Buffered Image from a source Image. This is a basic operation if you want to perform several enchantments and transformations to your Image and its fundamental for Image processing.

In short, in order to create a BufferedImage from Image one should take the following steps:

  • Load an image from a source usingToolkit.getDefaultToolkit().getImage method
  • Use an ImageObserver to monitor the loading of the image. When the image is fully load the user will be notified
  • Create a buffed image from the source image with a format more close to the custom display environment using GraphicsEnvironmentGraphicsDevice and GraphicsConfiguration to perform several image configurations
  • Use graphics.drawImage(sourceImage, 0, 0, null) to draw the source image into the buffer and create the BuffferedImage
  • And simply paint the buffered image in a new Frame

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.desktop;

import java.awt.Component;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;

public class ImageToBufferedImage {

  static BufferedImage image;
  static boolean imageLoaded = false;

  public static void main(String[] args) {

// The ImageObserver implementation to observe loading of the image

ImageObserver myImageObserver = new ImageObserver() {

  public boolean imageUpdate(Image image, int flags, int x, int y, int width, int height) {

    if ((flags & ALLBITS) != 0) {

imageLoaded = true;

System.out.println("Image loading finished!");

return false;

    }

    return true;

  }

};

// The image URL - change to where your image file is located!

String imageURL = "image.png";

/**

  * This call returns immediately and pixels are loaded in the background

  * We use an ImageObserver to be notified when the loading of the image

  * is complete

  */

Image sourceImage = Toolkit.getDefaultToolkit().getImage(imageURL);

sourceImage.getWidth(myImageObserver);

// We wait until the image is fully loaded

while (!imageLoaded) {

    try {

  Thread.sleep(100);

    } catch (InterruptedException e) {

    }

}

// Create a buffered image from the source image with a format that's compatible with the screen

GraphicsEnvironment graphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();

GraphicsDevice graphicsDevice = graphicsEnvironment.getDefaultScreenDevice();

GraphicsConfiguration graphicsConfiguration = graphicsDevice.getDefaultConfiguration();

// If the source image has no alpha info use Transparency.OPAQUE instead

image = graphicsConfiguration.createCompatibleImage(sourceImage.getWidth(null), sourceImage.getHeight(null), Transparency.BITMASK);

// Copy image to buffered image

Graphics graphics = image.createGraphics();

// Paint the image onto the buffered image

graphics.drawImage(sourceImage, 0, 0, null);

graphics.dispose();

// Create frame with specific title

Frame frame = new Frame("Example Frame");

// Add a component with a custom paint method

frame.add(new CustomPaintComponent());

// Display the frame

int frameWidth = 300;

int frameHeight = 300;

frame.setSize(frameWidth, frameHeight);

frame.setVisible(true);

  }

  /**
   * To draw on the screen, it is first necessary to subclass a Component and
   * override its paint() method. The paint() method is automatically called
   * by the windowing system whenever component's area needs to be repainted.
   */
  static class CustomPaintComponent extends Component {

public void paint(Graphics g) {

    // Retrieve the graphics context; this object is used to paint

    // shapes

    Graphics2D g2d = (Graphics2D) g;

    /**

     * Draw an Image object The coordinate system of a graphics context

     * is such that the origin is at the northwest corner and x-axis

     * increases toward the right while the y-axis increases toward the

     * bottom.

     */

    int x = 0;

    int y = 0;

    g2d.drawImage(image, x, y, this);

}

  }

}

 
This was an example on how to Create a BufferedImage from an Image.

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