The Color Dodge tool lets you brighten parts of your image with a brush tool. This can be used to bring out detail in dark or under-exposed areas.
Usage
Brush Button
Check this button for brush strokes to paint in the color dodge effect.
Eraser Button
Check this button for brush strokes to erase out the color dodge effect.
Brush Settings
Size
This is the diameter of the brush in pixels. Drag the slider to the left for a smaller brush. Drag the slider to the right for a larger brush.
Hardness
For a brush stroke with smooth edges, drag the slider to the left. For a brush stroke with hard edges, drag the slider to the right.
Strength
For subtle changes, drag the slider to the left. For more apparent brush strokes, drag the slider to the right.