Saving large PNG files with ImageIO.write

I have a program that draws onto a DrawPanel (extends JPanel) which is inside of a JInternalFrame. I have used ImageIO.write to successfully save the drawing as a PNG file, but a most unexpected thing happens if the image to be saved is larger than my desktop resolution. For instance, if the DrawPanel/output image is 1200*1200 pixels in size and my desktop resolution is 1024*768, I end up with a PNG file of 1200*1200 pixels that is a tiled image of the first 1024*768 from the upper left corner of the desired image.
Here is the portion of code responsible for exporting the image:
JInternalFrame jif = desktop.getSelectedFrame(); //desktop is a JDesktopPane
DrawPanel dp = jif.getDrawPanel();
BufferedImage image = new BufferedImage(dp.getWidth(), dp.getHeight(),
BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = image.createGraphics();
dp.paint(g2d);
g2d.dispose();
ImageIO.write(image, "png", targetFile);
I could very easily prevent the user from saving an image if it is bigger than the desktop resolution, but it is a necessity that large images can be saved.
Any help would be appreciated.

I've taken a look at that, on your recommendation, but I get the impression that this will filter the image and throw away information. Is this the case? The image will contain narrow lines and small text, so that woudn't be really be an option. I still want the image to be the full size it should be.
I had a go at incorporating it into my code, anyway, but I'm not really sure how to. Would I need to capture the image in some way other than with a BufferedImage?

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[img]http://img21.imageshack.us/img21/5396/41135434.png[/img]
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[img]http://img29.imageshack.us/img29/4089/69176653.png/img]
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[img]http://img718.imageshack.us/img718/4944/25526459.png[/img]
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[img]http://img577.imageshack.us/img577/8991/50003321.png[/img]
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