Index: applications/editors/josm/plugins/wmsplugin/src/wmsplugin/GeorefImage.java
===================================================================
--- applications/editors/josm/plugins/wmsplugin/src/wmsplugin/GeorefImage.java	(revision 22573)
+++ applications/editors/josm/plugins/wmsplugin/src/wmsplugin/GeorefImage.java	(revision 22581)
@@ -14,5 +14,4 @@
 import javax.imageio.ImageIO;
 
-import org.openstreetmap.josm.Main;
 import org.openstreetmap.josm.data.coor.EastNorth;
 import org.openstreetmap.josm.gui.NavigatableComponent;
@@ -79,5 +78,5 @@
 		}
 
-		boolean alphaChannel = Main.pref.getBoolean("wmsplugin.alpha_channel") && image.getTransparency() != Transparency.OPAQUE;
+		boolean alphaChannel = WMSLayer.PROP_ALPHA_CHANNEL.get() && image.getTransparency() != Transparency.OPAQUE;
 
 		try {
Index: applications/editors/josm/plugins/wmsplugin/src/wmsplugin/WMSLayer.java
===================================================================
--- applications/editors/josm/plugins/wmsplugin/src/wmsplugin/WMSLayer.java	(revision 22573)
+++ applications/editors/josm/plugins/wmsplugin/src/wmsplugin/WMSLayer.java	(revision 22581)
@@ -50,5 +50,5 @@
 		new ImageIcon(Toolkit.getDefaultToolkit().createImage(WMSPlugin.class.getResource("/images/wms_small.png")));
 
-	private static final BooleanProperty PROP_ALPHA_CHANNEL = new BooleanProperty("wmsplugin.alpha_channel", true);
+	public static final BooleanProperty PROP_ALPHA_CHANNEL = new BooleanProperty("wmsplugin.alpha_channel", true);
 
 	public int messageNum = 5; //limit for messages per layer