The writer behind Recenseo noticed that the screen on his MacBook Air didn’t have great color because:

The one made by Samsung has the perfect settings from the very beginning, but for some reason the LG doesn’t. To make the LG version look similarly as good as the Samsung screen, you’ll have to follow a couple quick steps.

I don’t have the screen with the “bad” color, but when I retweeted the article a few people pinged back thanking me because this change made a difference (for the better I assume). Give it a try, and with all these things backup first.