ImageIO.write() with "JPG" doesn't work

[Geon Goo]

I'm using JDK 1.4 with MS-Windows 2000 Korean version.
I tried ImageIO.write(). it works with "PNG" but, "JPG" and "GIF" doesn't.
source code is very simple.

File imageFile = new File("duke.gif"); 
BufferedImage img = ImageIO.read( imageFile ); 
File outFile = new File("duke.png"); 
ImageIO.write(img,"PNG",outFile); 

above code works fine. but when I change output file name as "duke.jpg" and ImageIO.write(img,"JPG",outFile)--> it doesn't work.
GIF doesn't work either.
does anyone know this?

[Nathan Pruett]

From a pdf file from JavaOne it looks like ImageIO supports "PNG", "JPEG", and "GIF" as options... it says that GIF is read only... I would guess due to the retarded LZW "patent"...

It looks like the ImageIO API can be extended to support other file formats pretty easily... so it should be pretty easy to write your own image readers and writers if you need to...

-Nate