The Dodge or Burn tool uses the current brush to lighten or darken the colors in your image. The mode will determine which type of pixels are effected.
Dodge or Burn Settings
The Pressure Sensitivity section sets whether opacity, hardness or size will be effected by pressure for input devices that support this option.
The exposure slider sets the strength of the dodge or burn effect.
The dodge effect lightens colors.
The burn effect darkens colors.
The highlights mode restricts the dodge or burn effects to lighter colored pixels.
The midtones mode restricts the dodge or burn effects to midtone pixels.
The shadows mode restricts the dodge or burn effects to darker colored pixels.
Default Keyboard Shortcut: Shift-D
Ctrl will switch dodge/burn mode. The mode will change back when Button1 is released.
Shift places the dodge or burn tool into straight line mode. Holding Shift while clicking Button1 will dodge or burn in a straight line. Consecutive clicks will continue to dodge or burn in straight lines that originate from the end of the last line.
Ctrl-Shift places the tool into straight line mode and constrains the angle of the created lines to 15 degrees.