Sci Fi movie name help

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There was a sci-fi movie where this white guy I think he was a carpenter teamed up with a black guy, and they found out that all the signs had two meanings. When they put on these sun glasses they could see the true meanings and everything was in black and white. I think it came from the 70's but it could be the 80's. Any help would be greatly appreciated. Thanks



Thanks a lot. Now to go and find that movie for my kid.