Curves was once one of Adobe Photoshop’s most complicated tools, but
CS4’s version of the dialogue makes it a snap. Now anyone can use this
powerful tool to improve a photo. Simply put, Curves graphs the tones in your
image. Control the darkest ones by adjusting the left side of the graph, the
brightest by adjusting the right: Pull down the curve on the left, and your
darker tones will darken. Lift it on the right, and your brighter tones will
brighten. Often, when you use Curves for contrast, your curve will be shaped
like the letter S. Why use Curves when the less complex Levels tool or
Brightness/Contrast slider seems to suffice? Because Curves makes nuanced
adjustments to contrast that give you smoother results and more beautifully
toned images.*Step 1* Your first step when editing or otherwise retouching a
picture in Photoshop is to get the contrast right. With a boost in contrast,
this flat image will start to sing. Adjustment Layers in CS4 are easier than
in previous versions, so use them. Create a Curves Adjustment Layer by
clicking on the Curves button in the Adjustments Panel (circled). When you
choose that button, an Adjustment Layer automatically appears in the Layers
Panel.
