The lightness of my Mac pro Screen changed

I have a Mac pro . Suddenly the lightness of the screen changed I don't mean it's darker but the color ,which is dark green, is more daze very pale. What happened?

Actually you have a laptop MBP not Mac Pro (tower)
https://discussions.apple.com/community/notebooks/macbook_pro
http://www.apple.com/support/macbookpro/

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