Pasted

public static Icon resizeIcon(final Icon icon, final int newWidth, final Component targetComponent) {
    try {
        final BufferedImage image = iconToImage(icon, targetComponent);
        final int w = icon.getIconWidth(), h = icon.getIconHeight();
        if (w == newWidth) return icon;
        final int newHeight = (int) round(h / (w / ((double) newWidth)), 0);
 
        final BufferedImage bi = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_ARGB);
        final Graphics2D g = (Graphics2D) bi.getGraphics();
        final HashMap<Key, Object> hints = new HashMap<Key, Object>(7);
        hints.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        hints.put(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
        hints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        hints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        hints.put(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
        hints.put(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_DISABLE);
        hints.put(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
        g.addRenderingHints(hints);
        g.drawImage(image, 0, 0, newWidth, newHeight, null);
        return new ImageIcon(bi);
    } catch (final Exception e) {
        return icon;
    }
}
 
public static BufferedImage iconToImage(final Icon icon, final Component targetComponent) {
    final int w = icon.getIconWidth();
    final int h = icon.getIconHeight();
    GraphicsConfiguration gc = targetComponent.getGraphicsConfiguration();
    if (gc == null) gc = Frame.getFrames()[0].getGraphicsConfiguration();
    final BufferedImage image = gc.createCompatibleImage(w, h, Transparency.TRANSLUCENT);
    final Graphics2D g = image.createGraphics();
    icon.paintIcon(targetComponent, g, 0, 0);
    g.dispose();
    return image;
}