Name: rmT116609 Date: 05/06/2004


FULL PRODUCT VERSION :
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)

java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b32c)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b32c, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Windows XP

A DESCRIPTION OF THE PROBLEM :
- When loading an 8-bit monochrome jpeg image via ImageIO.read(..), the image is displayed too bright. This does not happen when the image is loaded via Toolkit.createImage(..).
- This problem is visible when using Graphics2D for displaying with a scaling != 1 (via AffineTransform) and certain RenderingHints.
For the exact parameters, please see the code example.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Use the code example below. Compare the 2 image renderings; also use an image viewer (like IrfanView) to compare the appearance.
You can use the 8-bit monochrome image from
http://www.deutsche-synchronsprecher.de/baltho.jpg
and copy it into the classes folder, using the name "image.jpg".



REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.*;
import javax.swing.*;
import java.io.*;


public class JImagePanel extends JPanel
{
  Image xImage;
  java.awt.geom.AffineTransform xPaintScaling;
  
  public JImagePanel(Image xImage)
  {
    this.xImage = xImage;
    xPaintScaling = new java.awt.geom.AffineTransform();
  }
  
  public void paintComponent(Graphics g)
  {
    xPaintScaling.setToScale(1.2, 1.2);
    Graphics2D gg = (Graphics2D)g;
    gg.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
      RenderingHints.VALUE_INTERPOLATION_BICUBIC);
    gg.drawImage(xImage, xPaintScaling, JImagePanel.this);
  }
  
  public static void main(String[] args)
  {
    try
    {
      JFrame xJFrame = new JFrame();
      
      // The image must be an 8-bit monochrome JPEG
      String name = "image.jpg";
      
      Image xImage1 = Toolkit.getDefaultToolkit().createImage(name);
      
      // The following image is displayed too bright:
      Image xImage2 = javax.imageio.ImageIO.read(new File(name));
      
      JSplitPane xJSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
        new JImagePanel(xImage1), new JImagePanel(xImage2));
      xJFrame.getContentPane().add(xJSplitPane);
      
      xJFrame.setSize(800, 600);
      xJFrame.setVisible(true);
      xJSplitPane.setDividerLocation(0.5);
    }
    catch(Exception e)
    {
    }
  }
}


---------- END SOURCE ----------
(Incident Review ID: 260739)
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