![]() There are two sliders, one for purple fringing, one for green fringing (the purple can eliminate the reddish foreground fringe). With Lightroom 4.1, Adobe has managed to provide tools that can essentially eliminate BOTH phenomena in most pictures that exhibit it. However, Longitudinal CA (LoCA), which appears as a red fringe in areas in front of the point of focus, and as a green fringe in areas behind the point of focus, has been very difficult, if not impossible to correct. In fact, Lightroom 4 even did away with its sliders, having improved the tool to where just a single click can correct all LaCA. Software has been able to largely correct LaCA for a long time. Lateral chromatic aberrations (LaCA) appear as blue, yellow, cyan or magenta fringes, most prominent at the edges of the frame. In addition to purple fringing, chromatic aberrations have been an issue for all sorts of lenses. I see it most on my non-L fast Canon FD lenses from the 80s, where high image definition is possible, but so is extreme fringing. It’s most apparent on fast lenses that don’t use special glass, such as ultra high refraction glass or fluorite. If you use older lenses on your camera, or even modern lenses with less than perfect corrections, you’ll run into the dreaded purple fringing…a purple halo around very high contrast edges. The big feature of Lightroom 4.1 is an overhaul to the Defringing control. My guess is that the goal was for this to make it into Lightroom 4, but they just hadn’t gotten it working properly yet. It’s not all that common for a major feature to be included, especially so early in the game. Usually these incremental updates contain new camera profiles, some bug fixes and a perhaps a tweak here and there. Lightroom 4.0 was just released a few months ago, and Adobe is nearly ready to push out the 4.1 update, which will be free to all Lightroom 4 owners. Lightroom has been getting more and more powerful. Fringing Correction - Lightroom 4.1 - Click to Enlarge
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