## 9.3. Images

The contents of images generated by the OpenEmbedded build system can be controlled by the `IMAGE_FEATURES` and `EXTRA_IMAGE_FEATURES` variables that you typically configure in your image recipes. Through these variables you can add several different predefined packages such as development utilities or packages with debug information needed to investigate application problems or profile applications.

Current list of `IMAGE_FEATURES` contains the following:

- splash: Enables showing a splash screen during boot. By default, this screen is provided by `psplash`, which does allow customization. If you prefer to use an alternative splash screen package, you can do so by setting the `SPLASH` variable to a different package name (or names) within the image recipe or at the distro configuration level.

- ssh-server-dropbear: Installs the Dropbear minimal SSH server.

- ssh-server-openssh: Installs the OpenSSH SSH server, which is more full-featured than Dropbear. Note that if both the OpenSSH SSH server and the Dropbear minimal SSH server are present in `IMAGE_FEATURES`, then OpenSSH will take precedence and Dropbear will not be installed.

- x11: Installs the X server

- x11-base: Installs the X server with a minimal environment.

- x11-sato: Installs the OpenedHand Sato environment.

- tools-sdk: Installs a full SDK that runs on the device.

- tools-debug: Installs debugging tools such as `strace` and `gdb`.

- tools-profile: Installs profiling tools such as `oprofile`, `exmap`, and `LTTng`.

- tools-testapps: Installs device testing tools (e.g. touchscreen debugging).

- nfs-server: Installs an NFS server.

- dev-pkgs: Installs development packages (headers and extra library links) for all packages installed in a given image.

- staticdev-pkgs: Installs static development packages (i.e. static libraries containing `*.a` files) for all packages installed in a given image.

- dbg-pkgs: Installs debug symbol packages for all packages installed in a given image.

- doc-pkgs: Installs documentation packages for all packages installed in a given image.