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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();

  }