Java Language Tutorial => How to scale a BufferedImage

Example

 /**
 * Resizes an image using a Graphics2D object backed by a BufferedImage.
 * @param srcImg - source image to scale
 * @param w - desired width
 * @param h - desired height
 * @return - the new resized image
 */
private BufferedImage getScaledImage(Image srcImg, int w, int h){

    //Create a new image with good size that contains or might contain arbitrary alpha values between and including 0.0 and 1.0.
    BufferedImage resizedImg = new BufferedImage(w, h, BufferedImage.TRANSLUCENT);

    //Create a device-independant object to draw the resized image
    Graphics2D g2 = resizedImg.createGraphics();

    //This could be changed, Cf. http://stackoverflow.com/documentation/java/5482/creating-images-programmatically/19498/specifying-image-rendering-quality
    g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);

    //Finally draw the source image in the Graphics2D with the desired size.
    g2.drawImage(srcImg, 0, 0, w, h, null);

    //Disposes of this graphics context and releases any system resources that it is using
    g2.dispose();

    //Return the image used to create the Graphics2D 
    return resizedImg;
}

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Java Language Creating Images Programmatically How to scale a BufferedImage

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