Draw image in a indexed bufferedimage

Question

When i draw a image in a indexed bufferedimage the destination image is distorted. As source image i use a 256 color gif image. But when i use a TYPE_INT_RGB bufferedimage it's all good. I don't get it. Here's a is the simple code i'm using.
Image image = new ImageIcon("E:/Java/MapEdJava/MapEditor/pics/"+ImageName).getImage());
BufferedImage bi = new BufferedImage(image.getWidth(this),image.getHeight(this) , BufferedImage.TYPE_BYTE_INDEXED);
Graphics2D g2d = bi.createGraphics();
g2d.drawImage(image, 0, 0, this);

Answer 1

First, a plea to all posters: if you write "why does my code do this..." either include a brief program that recreates the problem, or give the url to such code. On one hand, posting a long listing doesn't encourage assistence from the forum -- you should be motivated enough to recreate your problem "in the small". On the other hand, not posting enough information doesn't help either: for example, if a particular image is giving you grief, include its url, or find an image with a publicly-reachable url. [Getting off soapbox :-]
Here's some quick&dirty code that, perhaps, demonstrates the poster's problem. It features a certain bald, chunky guy (no, not me!)
import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
public class ImageTest extends JComponent {
     public static void main(String[] args) throws java.io.IOException {
          java.net.URL url = new java.net.URL(
"http://java.sun.com/people/jag/JagWithDukeSmall.gif");
          JFrame frame = new JFrame(url.toString());
          Image image1 = new ImageIcon(url).getImage();
          BufferedImage image2 = javax.imageio.ImageIO.read(url);
          BufferedImage image3 = new BufferedImage(image2.getWidth(),image2.getHeight() ,
               BufferedImage.TYPE_BYTE_INDEXED);
          System.out.println("image2 colormodel="+image2.getColorModel().getClass().getName());
          System.out.println("image3 colormodel="+image3.getColorModel().getClass().getName());
          Graphics2D g2 = image3.createGraphics();
          g2.drawImage(image1, 0, 0, null);
          frame.getContentPane().add(new ImageTest(image1, image2, image3));
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.pack();
          frame.show();
     Image im1, im2, im3;
     ImageTest(Image im1, Image im2, Image im3) { //assume loaded into memory
          this.im1 = im1; this.im2 = im2; this.im3 = im3;
     public Dimension getPreferredSize() {
          return new Dimension(3*im1.getWidth(null), im1.getHeight(null));
     protected void paintComponent(Graphics g) {
          g.drawImage(im1, 0, 0, null);
          g.drawImage(im2, im1.getWidth(null), 0, null);
          g.drawImage(im3, 2*im1.getWidth(null), 0, null);
}Why is the third image grainy? I tried adjusting g2's rendering hints, specifically KEY_COLOR_RENDERING and KEY_DITHERING, but I couldn't see any difference. Perhaps the graininess is because image3 is constructed with (I assume) a generic half-tone(?) IndexColorModel. If you know your image has lots of blues, you could construct an ICM with more blue-tones and pass it to constructor:
BufferedImage(int width, int height, int imageType, IndexColorModel cm)On the other hand, image2 has an ICM and it looks OK -- why not load images using java.imageio.ImageIO.read()?
--Paul