Saving JPEG images in a batch process

Question

Please, I need help....
I'm making an application that loads an image, perform some manipulations and save it into a JPEG file..
The code I use to paint that image to a Graphics object is this:
          public void paintToImage(Graphics gr){               Graphics2D g = (Graphics2D)gr;               //CONFIGURO O RENDER PARA SER O MELHOR POSS?VEL                g.setRenderingHint(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);               g.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING,RenderingHints.VALUE_COLOR_RENDER_QUALITY);               //seto o clip rect               g.setClip(0,0,w,h);               //pinto o fundo de branco               g.setColor(Color.white);               g.fillRect(0,0,w,h);               if(img==null)return;               g.drawImage(img, -origemXY.width, -origemXY.height,this); //'this' means an instance of my JPanel          }I call this method to paint my image into a BufferedImage this way:
     BufferedImage bi = new BufferedImage(myComponent.width,myComponent.height, BufferedImage.TYPE_INT_RGB);     myComponent.paintToImage(bi.createGraphics());If I call it to a single image (like an ActionEvent for a selected image) it works fine...
But when I try to call it from a batch process, like a loop to paint several selected images, it aways produces a white JPEG.
All the code inside my "paintToImage()" method works fine but the line "g.drawImage(img, -origemXY.width, -origemXY.height,this);".
I know that because if I use "g.setColor(Color.red)" instead of "g.setColor(Color.white)" it produces a red JPEG.
Could it be a proble with the ImageObserver that I'm using?
The method below is invoked to save several images selected in a JTree, but it only produces white Images:
               public void actionPerformed(ActionEvent e){                    TreePath paths[] = filesTree.getSelectionPaths();                    for(int i=0;i<paths.length;i++){                         filesTree.setSelectionPath(paths);//this line sets the selected image that is about to be painted by my previewPane into a BufferedImage                         try{                         BufferedImage bi = new BufferedImage(previewPane.getImagePane().getPreferredSize().width, previewPane.getImagePane().getPreferredSize().height, BufferedImage.TYPE_INT_RGB);                         previewPane.paintToImage(bi.createGraphics());                         /* write the jpeg to a file */                         File file = new File("D:/VER/0000" + i + ".jpg");                         FileOutputStream out = new FileOutputStream(file);                         /* encodes the image as a JPEG data stream */                         JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);                         JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);                              param.setQuality(1.0f, false);                         encoder.setJPEGEncodeParam(param);                         encoder.encode(bi);                         out.close();                         }catch(IOException ioex){                              ioex.printStackTrace();                         }                    }               }
What is the problem?? What am I doing wrong?? any help wold be greate...
Thank's all and aloha from Brazil...

Answer 1

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