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Preference panel
In GroIMP the preferences (from java preferences) are the software options.
Most GroIMP options are managed by the Preference panel, which can be open from the menu at Panel>Preferences. By default, options are managed globally. i.e. when an option is set, every workbench will use it. There is an exception though. It is possible to setup an option file for a workbench, thus, using options defined in that file instead of the global ones.
See more:
Global options
Usually when a user change the options of GroIMP, he changes the global options. These options are stored when set in the java preferences (in ~/.java/.userPrefs/de/grogra/options/ + path of the option). This enables the options to be persistent between GroIMP uses. It also makes the options persistent when an other version of GroIMP is installed.
Global options are used by every workbench that do not include an option file.
The panel of global options can be open if the currently used workbench do not have an option file. In that case, when the preference panel is open (with Panel>Preferences) you can see:
Workbench options
Options for the Swing User Interface
The group UI Toolkit/Swing UI in the Preferences panel lets you choose the Look & Feel of the Swing user interface and whether window decorations (title bar, borders, etc.) should be provided by Swing or by the native window manager of your system. The set of available Look & Feels depends on your Java and GroIMP installations: GroIMP's binary distribution is bundled with the Kunststoff, Liquid and Tonic Look & Feels, the web page Javootoo provides a rich set of Look & Feels together with instructions how to install them. “Preferences Panel (Metal Look & Feel)” displays Java's default Look & Feel, Metal.
If you switch to another Look & Feel in the Preferences panel, the user interface will be redrawn immediately. However, changing the window decorations option only takes effect when a new window is opened. Also, there are Look & Feels which do not support window decorations.