"One of the most heavily touted features of most consumer-oriented cameras, and even some pro ones, is noise reduction. Unfortunately, it almost always makes your photos look terrible, and you should turn it off whenever possible.
Noise is an unfortunate byproduct of digital sensors. The dimmer the light in your scene, the higher you'll have to crank the ISO, and the more noise will appear in your image. Noise levels can range from barely-noticeable to oh-my-god-who-barfed-on-my-photo.
The solution put forth by camera-makers has been noise reduction. When your camera compresses the image as a JPG file, it applies an algorithm that is supposed to magically wipe away uglifying noise. It's a feature in every camera you can buy, and is almost always touted as being "Advanced" or "Superior" or "Next Gen." With great sounding words like that, why wouldn't every user crank up the Noise Reduction?
Because what you think is salvaging your photos is actually destroying them."
At http://reframe.gizmodo.com/turn-off-your-cameras-noise-reduction-1633706147.
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