How to understand ps layer mask

How to understand ps layer mask?

The layer mask is to cover the current layer with a layer of glass. This kind of glass can be transparent, semi-transparent, or completely opaque. The layer mask is an item in Photoshop. Very important function.

Use various drawing tools to paint on the mask (i.e. on the glass piece) (you can only paint black, white and gray). The mask becomes completely transparent where you paint black, and the image of the current layer is invisible. Painting white will make the painted part opaque, and you can see the image on the current layer. Painting gray will make the mask translucent. The degree of transparency is determined by the grayscale depth of the paint.

Function

①It is a special selection, but its purpose is not to operate the selection, on the contrary, it is to protect the selection from being manipulated . At the same time, areas that are not within the mask range can be edited and processed.

②Although the mask is a type of selection, it is quite different from a regular selection. A conventional selection shows an operation tendency, which is to process the selected area; while the mask is the opposite. It protects the selected area from operations, and applies operations to the non-masked areas.

In fact, it can be said like this: First of all, only black and white and the transition color (gray) in between can be used in the layer mask in PS. The black in the mask masks the contents of the current layer and displays the contents of the layers below the current layer. The white in the mask displays the contents of the current layer. The gray in the mask is semi-transparent, and the content of the layer below the previous layer is faintly visible

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