Craeting Thumnails from images

This code sniipet will tell us how to create thumbnails from images through java code

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();
  }

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Generate Thumbnail of an image in Java

This code takes an image and develops a thumbnail of that particular image

//code goes hereprivate 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();
    }

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