"Chromatic Aberration" aka "CA" aka "Purple Fringing" or "Green Fringing" can happen along high-contrast edges in your photographs. This tutorial shows you the chromatic aberration correction tool in Lightroom, and demonstrates how to use it, along with one gotcha to be aware of.
I see this most often when shooting at or near wide-open on very fast glass. The image in this video was shot on a Canon 85mm f/1.2 L mk II at f/1.6. Stopping down a little further would have produced an image with less CA to deal with, but of course the bokeh would change and the dark environment would introduce other kinds of challenges.
Wikipedia article on Chromatic Aberration - http://en.wikipedia.org/wiki/Chromati...
This tip will work on Lightroom 5 and newer. It probably works on older versions of Lightroom, too, but I don't happen to have version 4 at hand to test it on. (If you're using LR 4, 3, 2, 1, and this works for you, please comment below!) This video was recorded using Lightroom CC / 6.
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