Index: /applications/editors/josm/plugins/wmsplugin/src/wmsplugin/GeorefImage.java
===================================================================
--- /applications/editors/josm/plugins/wmsplugin/src/wmsplugin/GeorefImage.java	(revision 19506)
+++ /applications/editors/josm/plugins/wmsplugin/src/wmsplugin/GeorefImage.java	(revision 19507)
@@ -5,4 +5,5 @@
 import java.awt.Image;
 import java.awt.Point;
+import java.awt.Transparency;
 import java.awt.image.BufferedImage;
 import java.io.IOException;
@@ -77,5 +78,5 @@
 		}
 
-		boolean alphaChannel = Main.pref.getBoolean("wmsplugin.alpha_channel");
+		boolean alphaChannel = Main.pref.getBoolean("wmsplugin.alpha_channel") && image.getTransparency() != Transparency.OPAQUE;
 
 		try {