The Power of Gray - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 103

4. Choose the Dodge tool from the toolbar, and in the tool options at the top of the
screen, choose Midtones from the Range menu, set Exposure to 10%, and select
the Protect Tones checkbox ( Figure 2.27 ) .
Figure 2.27
Tip
It's very easy to overdo dodging and burning, so always use a low Exposure
amount so that it can be applied gradually and with more control.
5. With the Dodge & Burn layer active, use the Dodge tool to brighten areas of the
picture; to switch to the Burn tool and darken areas, hold down the Option/Alt key
while using the Dodge tool.
6. Option/Alt-click the eye icon of the dodge & burn layer to make it the only layer
visible ( Figure 2.28 ) .