BE THE CODER > Java > Image IO > How to scale an image

Java Image IO provides pluggable architecture for accessing images transparently. It is simple, flexible and allows us to plugin various image readers and writers with ease. The following example shows scaling an image using Java Image IO.

File Name :	com/bethecoder/tutorials/imageio/ScaleImageTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.imageio;



import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;



import javax.imageio.ImageIO;



public class ScaleImageTest {



  /**

   * @param args

   * @throws IOException 

   */

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



    File file = new File("C:/Temp/stpatricks_08.gif");

    BufferedImage image = ImageIO.read(file);

    

    int scaleX = (int) (image.getWidth() * 1.5);

    int scaleY = (int) (image.getHeight() * 1.5);



    Image scaledImg = image.getScaledInstance(scaleX, scaleY, Image.SCALE_SMOOTH);

    BufferedImage resizedImage = new BufferedImage(

        scaleX, scaleY, BufferedImage.TYPE_INT_ARGB);

    Graphics2D graphics = resizedImage.createGraphics();

    graphics.drawImage(scaledImg, 0, 0, scaleX, scaleY, null);

    graphics.dispose();

    

    ImageIO.write(resizedImage, "png", new File("c:/Temp/scaled_image.png")); 

  }



}