title: Java: Fastest way to change brightness of an image
body: <p>I was wondering what the fastest way to alter the brightness of an image.  I have implemented the 'RescaleOp' method but I don't know if this is the fastest method or there are others.  Here is my implementation where I input an Image, change the brightness, and return an Image:</p>
  
  <pre><code>public static Image setBrightness(Image i) {
      BufferedImage buff = new BufferedImage(i.getWidth(null), i.getHeight(null), BufferedImage.TYPE_INT_ARGB);
      buff.createGraphics().drawImage(i, 0, 0, null);
      RescaleOp op = new RescaleOp(brightness, offsets, null);
      BufferedImage buff1 = new BufferedImage(i.getWidth(null), i.getHeight(null), BufferedImage.TYPE_INT_ARGB);
      buff1.createGraphics().drawImage(buff, op, 0, 0);
      return Toolkit.getDefaultToolkit().createImage(buff1.getSource());
  }
  </code></pre>
  
  <p>PS: I also need to convert the BufferedImage back into an Image because my computer doesn't like rendering BufferedImages.</p>