Does OS X auto enhance images?

I'm noticing something weird on OS X 10.10 and 10.9.
My family had pictures taken by a professional photographer. When she sent the finished files to us, they looked strange and washed out on my wife's Windows laptop, but they looked fine on my MacBook. I asked the photographer to check the files, and she sent me new ones which she had processed differently, and they looked the same on my MacBook, and much better on the Windows laptop.
When I print the pictures from the Window's laptop, the originals look green-tinged and washed out, and the new ones look great. When I print the same pictures from my MacBook, they both look identical.
What is going on here? Does OS X do some kind of on the fly image enhancement? I notice it in Preview, iPhoto, and Quick Look in the Finder. The images all look good on my Mac, even the ones that appear washed out on the Windows laptop. Any ideas?

I agree that the display on the Mac is much better than the display on the Windows laptop (which is indeed a cheap one!) but how does this explain that two files that look different and print different on the Windows laptop, look the exactly same and print exactly the same (on the same printer) on the Mac? The exact same files!
It's like this:
File A: looks good on Windows, prints good on Windows; looks good on Mac, prints good on Mac
File B: looks bad on Windows, prints bad on Windows; looks good on Mac, prints good on Mac
It just seems like the Mac is doing something extra...

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