Lighroom in 60-Seconds: The Hidden Adjustment Brush Amount Slider

If you've applied some adjustments using the Adjustment Brush you can control the amount after the fact using the Amount slider (and if you just said, "What Amount slider?" this is for you. The slider itself is hidden, but once you make it visible, you'll dig it because it adjusts all the settings proportionally (essentially it does the math for you, which is nice).

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