Index: trunk/src/org/openstreetmap/josm/gui/layer/ImageryLayer.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/layer/ImageryLayer.java	(revision 3727)
+++ trunk/src/org/openstreetmap/josm/gui/layer/ImageryLayer.java	(revision 3729)
@@ -29,6 +29,6 @@
 import org.openstreetmap.josm.data.ProjectionBounds;
 import org.openstreetmap.josm.data.imagery.ImageryInfo;
+import org.openstreetmap.josm.data.imagery.ImageryInfo.ImageryType;
 import org.openstreetmap.josm.data.imagery.OffsetBookmark;
-import org.openstreetmap.josm.data.imagery.ImageryInfo.ImageryType;
 import org.openstreetmap.josm.data.preferences.IntegerProperty;
 import org.openstreetmap.josm.gui.MapView;
@@ -191,7 +191,7 @@
         Kernel kernel;
         if (sharpenLevel == 1) {
-            kernel = new Kernel(2, 2, new float[] { 4, -1, -1, -1});
+            kernel = new Kernel(3, 3, new float[] { -0.25f, -0.5f, -0.25f, -0.5f, 4, -0.5f, -0.25f, -0.5f, -0.25f});
         } else {
-            kernel = new Kernel(3, 3, new float[] { -1, -1, -1, -1, 9, -1, -1, -1, -1});
+            kernel = new Kernel(3, 3, new float[] { -0.5f, -1, -0.5f, -1, 7, -1, -0.5f, -1, -0.5f});
         }
         BufferedImageOp op = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
Index: trunk/src/org/openstreetmap/josm/gui/preferences/ImageryPreference.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/preferences/ImageryPreference.java	(revision 3727)
+++ trunk/src/org/openstreetmap/josm/gui/preferences/ImageryPreference.java	(revision 3729)
@@ -43,7 +43,7 @@
 import org.openstreetmap.josm.Main;
 import org.openstreetmap.josm.data.imagery.ImageryInfo;
+import org.openstreetmap.josm.data.imagery.ImageryInfo.ImageryType;
 import org.openstreetmap.josm.data.imagery.ImageryLayerInfo;
 import org.openstreetmap.josm.data.imagery.OffsetBookmark;
-import org.openstreetmap.josm.data.imagery.ImageryInfo.ImageryType;
 import org.openstreetmap.josm.gui.layer.ImageryLayer;
 import org.openstreetmap.josm.gui.layer.TMSLayer;
@@ -253,5 +253,5 @@
         this.btnFadeColor.setText(ColorHelper.color2html(colFadeColor));
         this.fadeAmount.setValue(ImageryLayer.PROP_FADE_AMOUNT.get());
-        this.sharpen.setSelectedIndex(ImageryLayer.PROP_SHARPEN_LEVEL.get());
+        this.sharpen.setSelectedIndex(Math.max(0, Math.min(2, ImageryLayer.PROP_SHARPEN_LEVEL.get())));
 
         // WMS Settings