JAI - Saved image has black background (unless screen config is True Color)

Question

Hi!
I'm trying to save images using JAI's codecs. Everything is okay if screen config is True Color, but if in 256 colors (or even in 65536 colors) the background of my images looks very dark...
Can you please have a look at the code bellow (and try it with some different screen configs). I'm really stuck with that issue; any suggestion may help...
NOTE:
- I've noticed this problem when using JAI's jpeg codec.
- The problem occurs with both JDK 1.3 and 1.4.
- The problem does not occur (only) if screen config is True Color.
- You must rerun the code after changing screen config.
Thanks for help...
cbmn2
+++++++++++++++++++
import java.awt.*;
import com.sun.media.jai.codec.*;
import javax.media.jai.*;
import java.awt.image.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.io.*;
import java.awt.image.renderable.*;
public class Test2 extends JFrame
String codecFormat = "jpeg";
String outFilePath = "./test.jpg";
JPanel jp;
JButton jb;
MyActionListener mal = new MyActionListener();
public Test2()
setSize(800,600);
Container cp = getContentPane();
cp.setLayout(null);
jp = new JPanel(){
public void paintComponent(Graphics g)
super.paintComponent(g);
Dimension dim = getSize();
// initialization...
//==================
g.setColor(Color.white);
g.fillRect(0, 0, dim.width, dim.height);
// some drawing...
//=================
int inset = 10;
g.setColor(Color.red);
g.fillRect(inset, inset, dim.width-2*inset, dim.height-2*inset);
jp.setBounds(10,10,400,300);
jp.setBorder(new EtchedBorder(EtchedBorder.LOWERED));
cp.add(jp);
jb = new JButton("Save image to '"+outFilePath+"'");
jb.setBounds(10,320,400,50);
jb.addActionListener(mal);
cp.add(jb);
class MyActionListener implements ActionListener
public void actionPerformed(ActionEvent ae)
Object source = ae.getSource();
if (source == jb)
jb_actionPerformed(ae);
public void jb_actionPerformed(ActionEvent ae)
try {
Image image = jp.createImage(jp.getWidth(), jp.getHeight());
jp.paint(image.getGraphics());
saveImage(image, outFilePath, codecFormat);
JOptionPane.showMessageDialog(this, "File '"+outFilePath+"' is now saved...");
catch(Exception e) {
JOptionPane.showMessageDialog(this, "Oops! An exception occured...");
public void saveImage(Image image, String filePath, String format) throws Exception
// conversion Image => RenderedImage
//==================================
RenderedImage renderedImage = JAI.create("AWTImage", image);
ParameterBlock pb = new ParameterBlock();
pb.addSource(renderedImage);
pb.add(DataBuffer.TYPE_BYTE);
renderedImage = JAI.create("format", pb);
// saving file
//=============
JAI.create("filestore", renderedImage, filePath, format);
public static void main(String[] args)
(new Test2()).setVisible(true);
}

Answer 1

try this:
BufferedImage bi = new BufferedImage(1728,500,BufferedImage.TYPE_BYTE_BINARY);
Graphics2D big = bi.createGraphics();
Graphics2D g2 = bi.createGraphics();
big.setFont(new Font("Dialog", Font.PLAIN, 20));
big.setColor(Color.WHITE);
big.fillRect(0,0,1728,500);
big.setColor(Color.BLACK);
big.drawString("Data/Time Created:" + new java.util.Date(), 80, 210);
big.drawString("POLICY NUMBER: 1711215 NAME OF CALLER: BENEFICIARY", 80, 230);
big.drawString("Requested: Loan Request XXXXXXXXXXXXXXXXXXXXXXXXXXXXX Current Loan Value: $0.00", 80, 270);
g2.drawImage(bi, 0, 0, null);