URGENT - how do I convert and image from colour to black and white?

Hi,
I'm new to Java, and I really need some code to convert an image from colour to black and white! I would really appreciate any help, but since I don't know much about Java I would prefer some code or links to websites with the code.
Thanks!!!

http://forum.java.sun.com/thread.jsp?forum=5&thread=368759

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URGENT - how do I convert and image from colour to black and white?

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