Proportionally scale and smooth

gistfile1.java

/**
 * @see http://today.java.net/pub/a/today/2007/04/03/perils-of-image-getscaledinstance.html
*/
private BufferedImage scale(BufferedImage image, int width, int height, int smoothingSteps) {
    int w = image.getWidth();
    int h = image.getHeight();

    int targetH, targetW;
    if (w > h) {
        targetW = width;
        targetH = (int) ((float) h / w * height);
    } else {
        targetH = height;
        targetW = (int) ((float) w / h * width);
    }

    BufferedImage i = image;
    for (int n = 0; (w / 2) >= targetW && (h / 2) >= targetH && n < smoothingSteps; i = draw(i, w, h)) {
        w /= 2;
        h /= 2;
        n++;
    }
    return draw(i, targetW, targetH);
}

private BufferedImage draw(BufferedImage image, int w, int h) {
    BufferedImage buffer = new BufferedImage(w, h, (image.getTransparency() == Transparency.OPAQUE) ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB);
    Graphics2D graphics2d = buffer.createGraphics();
    graphics2d.drawImage(image.getScaledInstance(w, h, Image.SCALE_AREA_AVERAGING), 0, 0, null);
    graphics2d.dispose();
    return buffer;
}