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The DOT component of GEF already supports setting the background color of a graph, see bug 521327. The Zest component of GEF should also be extended by an API to be able to set the background color/background image of a graph. After that, the DOT component should be refactored to use the Zest API for setting the background color.
See also forum thread https://www.eclipse.org/forums/index.php/t/1093674/