by Julieanne Kost
Parallel to Photoshop, Option (Mac) / Alt (Win) + “[" or "]” increases/decreases brush size. Adding the Shift key increases/decreases Feather. Adjusting the Flow is even easier, simply tap the “+ ” (plus) or “-” (minus) to increase/decrease. Note: the Flow sets the amount and speed at which an adjustment is applies , the Density caps the amount of change that can be made (even with multiple strokes).
In addition, Shift -drag constrains the Adjustment Brush to a straight line and Option (Mac) / Alt (Win) toggles the Adjustment Brush and Eraser tool.