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In a follow up, it appears maybe offscreen contains the previously rendered image and not the new image created when repaint(); is called. I must be missing something simple here.
I suspect your timing of the PixelGrabber call is wrong. Post a small demo code that is generally compilable, runnable and could reproduce your problem. See: http://homepage1.nifty.com/algafield/sscce.html and http://www.yoda.arachsys.com/java/newsgroups.html