Operation Manual

To adjust the levels of a single color channel in an image
1 In the Levels area of the Adjustments inspector or the Adjustments pane of the Inspector
HUD, choose a color channel from the Channel pop-up menu.
Choose a color channel from
the Channel pop-up menu.
2 Drag the Black Levels, Gray Levels, and White Levels sliders (or enter values in the
corresponding fields) to create the effect you want.
Adjusting the Levels of the Red Color Channel
You adjust the levels of the red color channel when you want to remove red and cyan
color casts in the image.
Before Red Levels adjustment After Red Levels adjustment
(moved Gray Levels slider right)
EffectRed adjustment
Adds cyan to the shadows, removing red.Move Black Levels slider right
Adds red to the midtones, removing cyan.Move Gray Levels slider left
Adds cyan to the midtones, removing red.Move Gray Levels slider right
Adds red to the highlights, removing cyan.Move White Levels slider left
563Chapter 17 Making Image Adjustments