Index: /trunk/src/org/openstreetmap/josm/gui/mappaint/styleelement/AreaElement.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/mappaint/styleelement/AreaElement.java	(revision 13367)
+++ /trunk/src/org/openstreetmap/josm/gui/mappaint/styleelement/AreaElement.java	(revision 13368)
@@ -89,5 +89,5 @@
             try {
                 color = new Color(((BufferedImage) img).getRGB(
-                        fillImage.getWidth() / 2, fillImage.getHeight() / 2)
+                        img.getWidth(null) / 2, img.getHeight(null) / 2)
                 );
             } catch (ArrayIndexOutOfBoundsException e) {