Image file to byte[] to resized image

Question

I have a byte[] that I have recieved from my server, this byte[] is read from an image. I now need to resize it and save it to the users computer as an image again. I have tried to do this, but lost information on the way. For example i tried making it into a BufferedImage, resize that image, and then write it to the computer. This however, caused (for me) very important image information to be lost, such as the jpg image tags. I could save this byte[] directly to the computer as an image and keep the image tags, but then I would have it in the same size. Is there any way for me to resize it before saving it, without losing information?
If it's impossible, please tell me so I know and can start thinking about how to do an alternative solution, however, I think this should be possible.
Edited by: Alle55555 on Jul 16, 2009 2:57 AM

Answer 1

This is my final code for solving the problem:
try
                              //Read the byte[] into an IIOImage
                              ImageReader ir = ImageIO.getImageReadersByFormatName("jpeg").next();
                              ByteArrayInputStream bais = new ByteArrayInputStream(imageBytes.get(viewingIndex));
                              ImageInputStream iis = ImageIO.createImageInputStream(bais);
                              ir.setInput(iis);
                              IIOImage image = new IIOImage(ir.read(0), null, ir.getImageMetadata(0));
                              //Resize the image
                              Image scalingImage = Toolkit.getDefaultToolkit().createImage(imageBytes.get(viewingIndex));
                              double scale = image.getRenderedImage().getWidth()/400;
                              scalingImage = scalingImage.getScaledInstance(400, (int)((double)(image.getRenderedImage().getHeight())/(double)(scale)), Image.SCALE_SMOOTH);
                              MediaTracker medTra = new MediaTracker(this);
                              medTra.addImage(scalingImage, 0);
                              medTra.waitForID(0);
                              BufferedImage bufferedImage = new BufferedImage(scalingImage.getWidth(this), scalingImage.getHeight(this), BufferedImage.TYPE_INT_RGB);
                              Graphics2D g = bufferedImage.createGraphics();
                              g.drawImage(scalingImage, 0, 0, this);
                              image.setRenderedImage(bufferedImage);
                              //Write the IIOImage to a chosen file
                              ImageWriter iw = ImageIO.getImageWritersByFormatName("jpeg").next();
                              ImageOutputStream imageOutputStream;
                              File selectedFile = fileChooser.getSelectedFile();
                              if(selectedFile.getAbsolutePath().endsWith(".jpg") || selectedFile.getAbsolutePath().endsWith(".JPG") || selectedFile.getAbsolutePath().endsWith(".jpeg") || selectedFile.getAbsolutePath().endsWith(".JPEG"))
                                   imageOutputStream = ImageIO.createImageOutputStream(fileChooser.getSelectedFile());
                              else
                                   imageOutputStream = ImageIO.createImageOutputStream(new File(fileChooser.getSelectedFile().getAbsolutePath() + ".jpg"));
                              iw.setOutput(imageOutputStream);
                              iw.write(image.getMetadata(), image, null);
                              imageOutputStream.close();
                         catch (Exception e){e.printStackTrace() ;}