Traditional Culture Encyclopedia - Photography major - How is this black mask background made?

How is this black mask background made?

On the first layer of the photo map, create a new layer, fill it with black, and then adjust the transparency.

To open a photo

2. Create a new layer (shortcut key: ctrl+shift+N) and fill it with black background color (shortcut key: ctrl+delete).

3. Adjust the opacity according to your own needs.