
All you have to do is click on it to turn the tool on and then click-and-drag on the particular tone range or area of the image to adjust it. You can also adjust it using an automated Lighroom tool, which appears as a dot at the top left of the Tone Curve Panel, right next to the Tone Curve. You can either adjust it by dragging the Curve itself or using the sliders bellow it, which will give you exactly the same flexibility. When you’re using this Curve, Lightroom basically helps you keep it as smooth in transition as possible, so that you don’t ruin your image by accidentally distorting the Curve too much. The one that I’ve been showing you so far (the enlarged screenshot at the top) is the easiest to operate, especially for beginners – lets call it the Region Curve for simplicity sake. Lightroom has two different Curves you can work with. Simple, isn’t it? Region Curve and Point Curve If, on the other hand, you wanted to make your Shadows part of the image brighter, you should click on the left-most third of the Tone Curve which represents the Shadows and gently drag it upwards to see them brighten up. All you need to decide on is which range of tones you want to alter, for example: if you want to make the Midtones of the image darker, just click on the middle portion of the Tone Curve and gently drag it downwards – you will notice your image getting darker as you drag it, similarly as it would if you were to decrease Exposure in the Basic Panel. While all of this may sound very technical, it is in fact quite simple to adjust. The tones get darker as you move lower and brighter as you move up the axis. The Y axis represents lightness of a given tones. You can also see the corresponding range shown to you by Lightroom once you hover over a specific slider under the Tone Curve, in the Region section of the Panel. In other words, going left to right, the curve starts with Shadows, Darks, Lights and ends with Highlights. In the middle you have Midtones, which are then further split into darker Midtones, called Darks in Lightroom, and brighter Midtones, called Lights.

The bottom axis of the Tone Curve is the Tone axis: the line starts with Shadows at the left-most end and ends with Highlights in the right-most end. The Tone Curve represents all the tones of your image.
