Operation Manual

Adjusting the Levels of the Green Color Channel
You adjust the levels of the green color channel when you want to remove green and
magenta color casts in the image.
Before Green Levels adjustment After Green Levels adjustment
(moved Gray Levels slider right)
EffectGreen adjustment
Adds magenta to the shadows, removing green.Move Black Levels slider right
Adds green to the midtones, removing magenta.Move Gray Levels slider left
Adds magenta to the midtones, removing green.Move Gray Levels slider right
Adds green to the highlights, removing magenta.Move White Levels slider left
Adjusting the Levels of the Blue Color Channel
You adjust the levels of the blue color channel when you want to remove blue and yellow
color casts in the image.
Before Blue Levels adjustment After Blue Levels adjustment
(moved White Levels and Gray Levels sliders left)
EffectBlue adjustment
Adds yellow to the shadows, removing blue.Move Black Levels slider right
Adds blue to the midtones, removing yellow.Move Gray Levels slider left
Adds yellow to the midtones, removing blue.Move Gray Levels slider right
564 Chapter 17 Making Image Adjustments