Defringe (Lightroom)
Defringe in Lightroom removes the coloured fringes, usually purple or green, that can appear along high-contrast edges. You find it in the lens corrections panel under Manual. It takes away those distracting colour fringes without touching the rest of your image.
These coloured fringes (chromatic aberration) show up mainly in backlight and at the edges of branches, roofs or metal objects. Tick 'Remove chromatic aberration' first, then use the defringe eyedropper to pick exactly the offending colour. With the purple and green sliders you fine-tune the amount and hue range. Tip: zoom to 100% on a contrast edge so you can really judge the effect and don't strip away too much colour.
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The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.