Recent versions of Lightroom come with an improved and far more powerful masking panel that allows you to make precise and powerful adjustments with ease. While the purpose of some of these masks is clear, the intersection function is a bit trickier to use. It is well worth learning, though, as it will add even more power to your editing tools. This helpful video tutorial will show you what it is and how to use it.
Coming to you from Anthony Morganti, this excellent video tutorial will show you how to use Lightroom's Intersect function in the new masking panel. The idea of intersection comes from the world of math and logic, in that an intersection of two statements will only be true if both individual statements are also true. When applied to masking, this means that an intersection will only reveal a layer or apply an adjustment if both masks do so individually at a given point. This allows you to create much more precise and intricate masks with ease, such as combining a gradient mask with a background mask to add a gradual transition across a sky with an uneven horizon. It really is a tool worth learning; check out the video above for the full rundown from Morganti.