Create image file from graphics object

Byron KiourtzoglouNovember 11th, 2012Last Updated: May 9th, 2013

1 2,808 1 minute read

With this tutorial we shall show you how to create an image file from graphics object. This is particularly useful when you want to create your own images out of custom made graphics.

Creating an image file from graphics object requires that you:

Create a new BufferedImage.
Create a Graphics2D using createGraphics.
Create a new File("myimage.png").
Use ImageIO.write(bufferedImage, "jpg", file) to create the image.

Let’s see the code:

package com.javacodegeeks.snippets.desktop;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class CreateImageFileFromGraphicsObject {

	public static void main(String[] args) throws IOException {

		int width = 250;
	    int height = 250;

	    // Constructs a BufferedImage of one of the predefined image types.
	    BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

	    // Create a graphics which can be used to draw into the buffered image
	    Graphics2D g2d = bufferedImage.createGraphics();

	    // fill all the image with white
	    g2d.setColor(Color.white);
	    g2d.fillRect(0, 0, width, height);

	    // create a circle with black
	    g2d.setColor(Color.black);
	    g2d.fillOval(0, 0, width, height);

	    // create a string with yellow
	    g2d.setColor(Color.yellow);
	    g2d.drawString("Java Code Geeks", 50, 120);

	    // Disposes of this graphics context and releases any system resources that it is using. 
	    g2d.dispose();

	    // Save as PNG
	    File file = new File("myimage.png");
	    ImageIO.write(bufferedImage, "png", file);

	    // Save as JPEG
	    file = new File("myimage.jpg");
	    ImageIO.write(bufferedImage, "jpg", file);

	}

}

This was an example on how to create image file from graphics object.