He's looking for the color correction in mental ray I should think mate.
@Brandon it's under the file attributes (of the texture) in the attribute editor -> color space.
Needs to be set to raw to take advantage of the 32 bit map as it will have been saved out without correction you don't want MR adding gamma to your displacement or your bump / normal. if you saved out a 16 / 32 bit image. The correction upsets the black white balance on the image hence the need to turn it off.
Color correction in Maya is now on by default so it will gamma correct 16 / 32 bit images by default. Used to be to the other way round. If your using a version below 2014 or maybe 2015 i forget then you won't need to do it you'll just run in to the problem in reverse.
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