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In traditional photography, if you wanted to darken a sky without darkening the foreground, you would have used a graduated neutral density filter on the front of your camera lens. The filter was usually two or three stops darker at the top and would then lighten back to clear towards the center. You can still use graduated glass filters in your photography, but you also have the option of adding the effect in Lightroom with the Graduated Filter feature. What’s even better is that the Graduated Filter in Lightroom isn’t just limited to going from dark to light. You can also use it to lighten an area of an image or change the color temperature of the filtered area (this feature is only available in Lightroom 4). In fact, just about any othe....