This tool allows you to lighten the tones of the colors in an image.
Click on Dodge on the Tools bar.
In the "Dodge Options" dialog select the style and shape of the brush (see Brushes).
Choose the tonal range on which to concentrate from the following:
Highlights concentrates on the lighter tones, making them lighter still, but also affects the darker tones.
Midtones concentrates on all tones, making them lighter, apart from the very light or dark.
Shadows concentrates on the darker tones, making them lighter, but also affects other tones.
Adjust the value in Exposure to change the amount of tonal lightening you want to allow. A higher value results in a greater lightening over the tonal range chosen. (This effect is similar to a photographer’s use of light intensity when exposing a negative.)
Proceed to drag the brush across the relevant areas.
See: