The Curves Eyedropper technique provides a fast way to simultaneously correct color and fix exposure problems in your photo all at once. That’s a lot of benefit for just a few clicks.
Here’s how it works.
1. Open a photo that you think needs correcting.
2. Create a Curves Adjustment Layer by clicking on the Adjustment Layer icon in the Layers Palette, and then choosing Curves from the drop-down menu.
3. Near the bottom of the Curves Dialog, you will see a row of three eyedroppers. From left to right they are used to set the Black Point, the Gray Point, and the White Point.
4. Ideally you should set specific color values for each of these droppers (although you can skip this step and try it with the default values if you like). Double-click on the Black dropper to open its settings, and in…