Documentation
Menu – Select
Select All
•Selects area of all image.
•This command can be also called by pressing keys Ctrl+A.
Deselect
•Cancels selected area in the current image.
•This command can be also called by pressing keys Ctrl+D.
Invert Selection
•Inverts selected area in the current image.
•This command can be also called by pressing keys Ctrl+Shift+I.