Pushing and pulling darker and lighter pixels away from medium gray is the definition of the word Contrast in digital photography. When we add contrast to our photographs we are choosing to make one group of pixels brighter and another group darker. Adding contrast brings depth into our digital images.
The human eye needs this separation away from medium gray to distinguish edges and detail, but doing it right often requires being selective about which tones we adjust.
The Contrast slider at the top of Adobe Photoshop Lightroom’s Basic Panel is fine when you want to make quick, broad adjustments. This slider does what it says, but it lacks elegance and precision.
The Tone Curve Panel in Adobe Photoshop Lightroom, on the other hand, is the place to go when you want real control. As you will see in this video tutorial, nuanced contrast changes require multiple sliders and the ability to target specific tones.