I want to resize an JPG image that has been uploaded from a browser.

I use the JPEGCodec and decode the file to a BufferedImage.

Now I want to resize it.

At first I made a Graphics2D object and tried to perform an AffineTransform on it. Then I encode to JPEG and look at the result. But I end up getting the original image with a thumbnial version (the scale I wanted) on top of it. I still have the full size of the BufferedImage/Graphics2D.

See some code:

			

			// DECODE from JPEG
			

			JPEGImageDecoder decode = JPEGCodec.createJPEGDecoder(in);
			

			BufferedImage bi = null;
			

			try {
			

			bi = decode.decodeAsBufferedImage();
			

			

			height = bi.getHeight();
			

			width = bi.getWidth();
			

			

			} catch (IOException ie) {
			

			System.out.println("Decode error");
			

			ie.printStackTrace();
			

			}
			

			

			System.out.println("Height : " + height );
			

			System.out.println("Width : " + width );
			

			

			// Make a graphics element
			

			Graphics2D g2d = bi.createGraphics();
			

			

			// Scale
			

			Container cont = new Container();
			

			AffineTransform trans = new AffineTransform();
			

			trans.scale(.5, .5);
			

			

			// Add the scaled image
			

			g2d.drawImage((Image)bi, trans, cont);
			

			

			

			/** @todo Here I want to crop the image before I encode it to JPEG */
			

			

			

			// ENCODE to JPEG
			

			JPEGImageEncoder encode = JPEGCodec.createJPEGEncoder(out);
			

			try {
			

			encode.encode(bi);
			

			}
			

			catch (ImageFormatException ife) {
			

			ife.printStackTrace();
			

			}
			

			catch (IOException ie) {
			

			ie.printStackTrace();
			

			}
			

			

			System.out.println("File written...");