Java Graphics How to - Resize image

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Question

We would like to know how to resize image.

Answer

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
//from   w w  w.  j  a  va2 s.co  m
import javax.imageio.ImageIO;

public class Main {
    public static BufferedImage resize(int targetWidth, int targetHeight,
            BufferedImage src) {
        double scaleW = (double) targetWidth / (double) src.getWidth() ;
        double scaleH = (double) targetHeight / (double) src.getHeight() ;

        double scale = scaleW < scaleH ? scaleW : scaleH;

        BufferedImage result = new BufferedImage((int) (src.getWidth() * scale),
                (int) (src.getHeight() * scale), BufferedImage.TYPE_INT_ARGB);

    Graphics2D g2d = result.createGraphics();
        g2d.drawImage(src, 0, 0, result.getWidth(), result.getHeight(), null);
        g2d.dispose();

        return result;
    }

    public static void main(String[] args) throws IOException {
        BufferedImage origin = ImageIO.read(new URL("http://www.java2s.com/style/download.png"));

        File dest = new File("c:/Java_Dev/out.png");
        ImageIO.write(resize(200, 200, origin), "PNG", dest);
    }
}

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