Layers: The Complete Guide to Photoshop’s Most Powerful Feature

How Do I...

?	TURN OFF OR DISABLE A LAYER MASK?
Shift-click on the layer mask thumbnail in the Layers panel. You’ll see a red X appear over it. It’s still there, but the layer mask is disabled. Shift-click again on it to enable it.
?	VIEW THE CONTENTS OF A LAYER MASK?
To see the contents of a layer mask, or see it in black-and-white mode, Option-click (PC: Alt-click) on it. Now you’ll just see the mask onscreen, and you can adjust it (paint on it) there just as you normally would. Option-click on it again to get back to the normal view.
?	MOVE A LAYER MASK TO ANOTHER LAYER?
To move a layer mask, just click-and-drag the layer mask to another layer.
?	COPY A LAYER MASK TO ANOTHER LAYER?
To copy a layer mask, press-and-hold the Option (PC: Alt) key and click-and-drag ...