Adjustment Brush Masks and Pins
*Adobe Bridge CS4 and Adobe Camera Raw 5 Tip*
When you paint on a photo using the Adjustment Brush ( K ), a mask is created that shows where the effects of the Adjustment Brush are applied. By default, the mask isn't visible, but you can press the O key to toggle the visibility. Note that you can't view the effects of the Adjustment Brush when the mask is visible. If the mask pin is missing, press the H key to show the pin.