How to access individual pixels in a frame...

Hi there,
I am newbie in java and i basically want to know how to access individual pixels in the frame so that i can change the RGB color values of some definite block of pixels. I did have a look at the RotationEffect java example at
http://java.sun.com/products/java-media/jmf/2.1.1/solutions/RotationEffect.html but couldnt get much information from that.....If anybody has some information on this pls lemme know at the earliest...Regards, Kunal

The source code examples at http://www.exactfutures.com/index02.htm may help.

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