Scaling up and down BufferedImages by percent?

Question

Hi, I have a BufferedImage and I would like to know the exact syntax to scale up and down an image by percentage. Basically I want to scale the BufferedImage by a specific percentage like scale down to 50% or scale up to 150%. Anyone know any methods to do so? If I can use a specific library then which library can I use and how to use it(clear syntax like: profileImage.scale(50);)
I read an image using the following:
BufferedImage profileImage = ImageIO.read (new File ("Image.bmp"));And I would appreciate if the libraries imported are posted too. Thanks
Edited by: Taufiq on Feb 26, 2008 2:54 PM

Answer 1

Demo:
import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;
import javax.swing.*;
public class ImageResizingExample {
    public static void main(String[] args) throws IOException {
        URL url = new URL("http://blogs.sun.com/jag/resource/JagHeadshot-small.jpg");
        BufferedImage image = ImageIO.read(url);
        if (image == null) throw new NullPointerException();
        Image smaller = scaledInstance(image, 0.5);
        BufferedImage blurry = rescaled(image, AffineTransformOp.TYPE_NEAREST_NEIGHBOR, 1.5);
        BufferedImage better = rescaled(image, AffineTransformOp.TYPE_BICUBIC, 1.5);
        display(image, smaller, blurry, better);
    static Image scaledInstance(BufferedImage im, double factor) {
        int w = (int) (im.getWidth() * factor);
        int h = (int) (im.getHeight() * factor);
        return im.getScaledInstance(w, h, Image.SCALE_AREA_AVERAGING);
    static BufferedImage rescaled(BufferedImage im, int hint, double factor) {
        AffineTransform xform =  AffineTransform.getScaleInstance(factor, factor);
        return new AffineTransformOp(xform, hint).filter(im, null);
    static void display(final Image... images) {
        EventQueue.invokeLater(new Runnable(){
            public void run() {
                JPanel cp = new JPanel(new GridLayout(0,2, 5, 5));
                for(Image image : images) {
                    cp.add(new JLabel(new ImageIcon(image)));
                JFrame f = new JFrame("ImageResizingExample");
                f.setContentPane(cp);
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.pack();
                f.setLocationRelativeTo(null);
                f.setVisible(true);
}