Capturing pixels within area

Hi,
It's been a while since I've played with graphics in Java, and there seem like some great advances in Java2D for things which I had to do manually the last time I was playing.
Anyway, for a project I'd like to revive, I want to be able to be able to calculate things like the average R,G,B, alpha etc values for all pixels within an arbitrary area. The area won't necessarily be any particular shape, i.e. it could be the intersection between a circle and a triangle, for example, where perhaps the two shapes were java.awt.geom.Area objects to begin with. I can visualize how to do this in the "machine-crippling" way, but given the Java2D samples I've seen (especially the masking effects etc), I'm sure there must be a clever way to do it.
Any ideas?
cheers,
Ian

if you look for something top-level: http://java.sun.com/products/java-media/jai/

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Capturing pixels within area

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