As soon as you create a layer mask, it acts on the image. The
command allows you to
suspend this action. When you click on the menu entry, a check is
displayed next to it and the border of the layer mask's thumbnail in
the Layers Dialog turns red.
Activating the Command
You can access this command from the image menubar through
→ → ,
or by holding down the Ctrl key
on some systems) and single-clicking on the layer mask's thumbnail
in the Layers Dialog.
You can undo this action by unchecking the menu entry in the
-clicking) again on the layer mask's thumbnail.
menu or by