The Parametric Curve In Lightroom
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If you are just getting started with curves, try the parametric curve in Lightroom. It is really a slider-based curves control, so it is more limited than the freeform curve tool. Yet the parametric curve can get some hands on practice adjusting a tone curve. Also, you do have control over what tonal regions are considered shadows, darks, lights, and highlights.
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Precision Edits Using Intersects In Lightroom