The preferences dialog can be accessed from the main menu, through → . It lets you customize many aspects of the way GIMP works. The following sections detail the settings that you can customize, and what they affect.
      All of the Preferences information is stored in a file called
      gimprc in your
      configuration folder, so
      if you are a “power user” who would rather work with a
      text editor than a graphical interface, you can alter preferences by
      editing that file.  If you do, and you are on a Linux system,
      then man gimprc will give you a lot of
      technical information about the contents of the file and what
      they are used for.