Dithering no longer works under 1.4.2

Question

I had this posted in the AWT forum and I was suggested that the issue was better suited to the Java 2D forum:
I am trying to convert a jpeg to a 1 bit per pixel Buffered image.
The current implementation is working fine under 1.3.1_05 but not under any of the 1.4.2 JVM's that I have tried. Any tips on what I am doing wrong?
Here is a snippet of the the code:
// input stream is from a jpeg file:
JPEGImageDecoder jpgDecoder = JPEGCodec.createJPEGDecoder(src);
// decompress to a AWT buffered image. this will be our source image in the color
// space of the original jpg.
BufferedImage srcImg = jpgDecoder.decodeAsBufferedImage();
// create an output buffered image in the color space that we need. in this case
// one bit binary.
BufferedImage destImage =null;
Graphics2D graphics=null;
int bufferedImageType = BufferedImage.TYPE_BYTE_BINARY;
// cols and rows are passed in as parameters
destImage = new BufferedImage(cols,rows,bufferedImageType);
// create a Graphics2D context out of the Output buffered image and draw the
// source image to it. This will convert the color space for us. At least it does under 1.3.1
graphics=destImage.createGraphics();
// the following commented line has the effect of inverting the color for us.
// this would be nice except it seems to have the effect of hanging 1.3.1 JVM.
//graphics.setXORMode(Color.WHITE);
graphics.drawImage(srcImg,null,0,0);
// get the data buffer from the destImage and send it back to the caller
DataBufferByte dataBuffer = (DataBufferByte)destImage.getData().getDataBuffer();
return dataBuffer;
This works great under 1.3.1 The returned data buffer is merged with some other images and the result is a nicely dithered 1 bpp output image. (I am currently generating either tiff or png at 1bpp).
Under 1.4.2 it seems that instead of dithering I get some sort of thresholding that looks awfull. No attempt to emulate grayscale is made at all.
Has anyone encounterd this problem? I have looked through the forum but nothing similar seems to be posted.
If you need a more concrete example I can post a main that reads the jpg, converts it to 1bpp and saves it as a tiff.
Thanks
Richard Seabright.

Answer 1

Here is a sample class that demonstrates the issue (behaves differently under 1.4.2 than it does under 1.3.1):
import java.awt.*;
import java.awt.color.*;
import java.awt.image.*;
import javax.swing.*;
public class ColorConvert {
public static void main(String[] args) {
BufferedImage image0 = createSample();
BufferedImage image1 = convert(image0);
display(image0, image1);
public static BufferedImage createSample() {
BufferedImage result = new BufferedImage(450, 150, BufferedImage.TYPE_INT_RGB);
Graphics2D g = result.createGraphics();
g.setPaint(Color.yellow);
g.fillOval(10, 25, 100, 100);
g.setPaint(Color.red);
g.fillOval(80, 25, 100, 100);
g.setPaint(Color.green);
g.fillOval(150, 25, 100, 100);
g.setPaint(Color.blue);
g.fillOval(220, 25, 100, 100);
g.dispose();
return result;
public static BufferedImage convert(BufferedImage image) {
int w = image.getWidth(), h = image.getHeight();
BufferedImage result = new BufferedImage(w, h, BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g = result.createGraphics();
g.drawImage(image, null, 0, 0);
g.dispose();
return result;
public static void display(BufferedImage image0, BufferedImage image1) {
JPanel panel = new JPanel(new GridLayout(0,1));
panel.add(createLabel(image0));
panel.add(createLabel(image1));
JFrame f = new JFrame("ColorConvert");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setContentPane(panel);
f.pack();
f.setVisible(true);
public static JLabel createLabel(BufferedImage image) {
JLabel label = new JLabel(new ImageIcon(image));
label.setOpaque(true);
label.setBackground(Color.white);
label.setBorder(BorderFactory.createEtchedBorder());
return label;
}