Photoshop : Curves dialog box

You can use the Curves dialog box or Levels dialog box to adjust the entire tonal range of an image. The Curves dialog box lets you adjust up to 14 different points throughout an image’s tonal range (from shadows to highlights). The Levels dialog box has only three adjustments (white point, black point, gamma). You can also use the Curves dialog box to make precise adjustments to individual color channels in an image. You can save Curves dialog box settings as presets. See Save and reapply adjustment dialog box settings.

Curves dialog box

A. Adjust curve by adding points.

B. Draw a curve with the pencil.

C. Highlights

D. Midtones

E. Shadows

F. Black and white point sliders.

G. Curve display options

H. Set black point.

I. Set gray point.

J. Set white point.

K. Show Clipping