In article ,
tony cooper wrote:
Both are layers, but a layer mask is a type of layer that allows editing of the layer with the ability to reverse the editing by changing the foreground color between black and white.
That's not quite true.
A layer mask is a way to conceal parts of a layer by making those parts invisible. For example, you can create a layer, put a round layer mask on it, and only the part of the layer contained inside the round layer mask will be visible.
It does not allow you to undo other kinds of changes, such as changes to the color balance of the layer. All it lets you do is go back later and unhide the parts you had hidden, or hide the parts you had showing.
Effectively, any time you want to erase part of a layer, always use a layer mask; never use the eraser. Thats what the mask does; erases part of the layer, in a way that lets you bring it back if you change your mind.
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