I've found these calls let me manipulate BufferedImage's easily:

image.getRaster().getDataElements(x,y,w,h,intArray)
image.getRaster().setDataElements(x,y,w,h,intArray)

Will this work for you?

Also here is an article explaining why talking to DataBuffers can be really 
bad, depending on what you later do with that BufferedImage:
http://javagraphics.blogspot.com/2007/04/managed-images.html
[Message sent by forum member 'mickleness' (mickleness)]

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