java image resize

// First method : bad
            Image img = icon.getImage();
            Image imgNew = img.getScaledInstance( scaleW, scaleH,                                                        Image.SCALE_AREA_AVERAGING);
 
 
// Alternative method (form the mentioned article)
 
...
             BufferedImage img = toBufferedImage(icon.getImage());
             BufferedImage imgNew = resize(img,scaleW, scaleH);
...
 
    public static boolean hasAlpha(Image image) {
           // If buffered image, the color model is readily available
           if (image instanceof BufferedImage) {return ((BufferedImage)image).getColorModel().hasAlpha();}
       
           // Use a pixel grabber to retrieve the image's color model;
           // grabbing a single pixel is usually sufficient
           PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
           try {pg.grabPixels();} catch (InterruptedException e) {}
       
           // Get the image's color model
           return pg.getColorModel().hasAlpha();
       }
   
 
 
 
  public static BufferedImage toBufferedImage(Image image) {
      if (image instanceof BufferedImage) {return (BufferedImage)image;}
  
      // This code ensures that all the pixels in the image are loaded
      image = new ImageIcon(image).getImage();
  
      // Determine if the image has transparent pixels
      //boolean hasAlpha = hasAlpha(image);
  
      // Create a buffered image with a format that's compatible with the screen
      BufferedImage bimage = null;
      /*
      GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
      try {
          // Determine the type of transparency of the new buffered image
          int transparency = Transparency.OPAQUE;
          if (hasAlpha == true) {transparency = Transparency.BITMASK;}
  
          // Create the buffered image
          GraphicsDevice gs = ge.getDefaultScreenDevice();
          GraphicsConfiguration gc = gs.getDefaultConfiguration();
          bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency);
      } 
      catch (HeadlessException e) {} //No screen
      */
      if (bimage == null) {
          // Create a buffered image using the default color model
          int type = BufferedImage.TYPE_INT_RGB;
          //if (hasAlpha == true) {type = BufferedImage.TYPE_INT_ARGB;}
          bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
      }
  
      // Copy image to buffered image
      Graphics g = bimage.createGraphics();
      printGraphics2D(1,(Graphics2D) g);
      // Paint the image onto the buffered image
      g.drawImage(image, 0, 0, null);
      g.dispose();
  
      return bimage;
  }
 
   
   private static BufferedImage resize(BufferedImage image, int width, int height) {
      int type = image.getType() == 0? BufferedImage.TYPE_INT_ARGB : image.getType();
      BufferedImage resizedImage = new BufferedImage(width, height, type);
      Graphics2D g = resizedImage.createGraphics();
      g.setComposite(AlphaComposite.Src);
 
      g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
      RenderingHints.VALUE_INTERPOLATION_BILINEAR);
 
      g.setRenderingHint(RenderingHints.KEY_RENDERING,
      RenderingHints.VALUE_RENDER_QUALITY);
 
      g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
      RenderingHints.VALUE_ANTIALIAS_ON);
 
      g.drawImage(image, 0, 0, width, height, null);
      g.dispose();
      return resizedImage;
   }

                                  

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