Purple tint on D600 sensor?

While under normal circumstances, I would call that a problem, what do the original non-processed images look like? A few people in the past have taken severely underexposed photos and have tried to turn night to day and are disappointed with the patterned noise and colored glows that come out.

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Joe Braun Photography
Some of my favorite images here:
http://www.citrusmilo.com/favorites/