My xbox video has a purple tint on certain things. What can I do?

I have a pretty alright HDTV that I play my Xbox 360 on. It's about a year and a half years old, and it usually works fine. But I've been seeing a multicolored tint (mostly purple) over certain colors, usually semi-dark colors. For example, the was on Swordbase in Halo Reach or Alan Wake's beard type deal. the games work, but it's really annoying. Is there any settings I can change or something to get rid of this?
The purple-ish film is a bit offset from the original imagine. And it's not the brightness, because the Xbox dashboard looks fine, it's just certain colors.
 
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