// description of your code here
Used to create a thumbnail of an image

        private void createThumbnail(String filename, int thumbWidth, int thumbHeight, int quality, String outFilename)
                throws InterruptedException, FileNotFoundException, IOException
        {
                // load image from filename
                Image image = Toolkit.getDefaultToolkit().getImage(filename);
                MediaTracker mediaTracker = new MediaTracker(new Container());
                mediaTracker.addImage(image, 0);
                mediaTracker.waitForID(0);
                // use this to test for errors at this point: System.out.println(mediaTracker.isErrorAny());
                
                // determine thumbnail size from WIDTH and HEIGHT
                double thumbRatio = (double)thumbWidth / (double)thumbHeight;
                int imageWidth = image.getWidth(null);
                int imageHeight = image.getHeight(null);
                double imageRatio = (double)imageWidth / (double)imageHeight;
                if (thumbRatio < imageRatio) {
                        thumbHeight = (int)(thumbWidth / imageRatio);
                } else {
                        thumbWidth = (int)(thumbHeight * imageRatio);
                }
                
                // draw original image to thumbnail image object and
                // scale it to the new size on-the-fly
                BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
                Graphics2D graphics2D = thumbImage.createGraphics();
                graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
                graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
                
                // save thumbnail image to outFilename
                BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(outFilename));
                JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
                JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
                quality = Math.max(0, Math.min(quality, 100));
                param.setQuality((float)quality / 100.0f, false);
                encoder.setJPEGEncodeParam(param);
                encoder.encode(thumbImage);
                out.close();
        }