diff --git a/src/main/java/plugins/adufour/roi/ROIConvexHullDescriptor.java b/src/main/java/plugins/adufour/roi/ROIConvexHullDescriptor.java
index aeaf1abaeff9bba685e95b950ee60e3037facaa6..0cd08985115aea244bb0eaaa064d13ae4c6d3483 100644
--- a/src/main/java/plugins/adufour/roi/ROIConvexHullDescriptor.java
+++ b/src/main/java/plugins/adufour/roi/ROIConvexHullDescriptor.java
@@ -47,6 +47,24 @@ public class ROIConvexHullDescriptor extends Plugin implements PluginROIDescript
         {
             return "%";
         }
+        
+        @Override
+        public Object getNullValue()
+        {
+            return Double.valueOf(0d);
+        }
+        
+        @Override
+        public Object getMinValue()
+        {
+            return Double.valueOf(0d);
+        }
+
+        @Override
+        public Object getMaxValue()
+        {
+            return Double.valueOf(100d);
+        }
 
         @Override
         public Object compute(ROI roi, Sequence sequence) throws UnsupportedOperationException, InterruptedException
diff --git a/src/main/java/plugins/adufour/roi/ROIRoundnessDescriptor.java b/src/main/java/plugins/adufour/roi/ROIRoundnessDescriptor.java
index f8b9951b391f3c81a6030eb40c75d4e45a286666..c9f71264860a75add5cb7f1f924489695f5bf512 100644
--- a/src/main/java/plugins/adufour/roi/ROIRoundnessDescriptor.java
+++ b/src/main/java/plugins/adufour/roi/ROIRoundnessDescriptor.java
@@ -60,6 +60,24 @@ public class ROIRoundnessDescriptor extends Plugin implements PluginROIDescripto
             return "%";
         }
 
+        @Override
+        public Object getNullValue()
+        {
+            return Double.valueOf(0d);
+        }
+        
+        @Override
+        public Object getMinValue()
+        {
+            return Double.valueOf(0d);
+        }
+
+        @Override
+        public Object getMaxValue()
+        {
+            return Double.valueOf(100d);
+        }
+
         @Override
         public Object compute(ROI roi, Sequence sequence) throws UnsupportedOperationException, InterruptedException
         {
diff --git a/src/main/java/plugins/adufour/roi/ROISphericityDescriptor.java b/src/main/java/plugins/adufour/roi/ROISphericityDescriptor.java
index 2fe7ae30b45340269a4869d187f9aaf5f1558b91..24b6dcddfa49629bceeb7c40d49a219d6feacb79 100644
--- a/src/main/java/plugins/adufour/roi/ROISphericityDescriptor.java
+++ b/src/main/java/plugins/adufour/roi/ROISphericityDescriptor.java
@@ -45,6 +45,24 @@ public class ROISphericityDescriptor extends Plugin implements PluginROIDescript
             return "%";
         }
 
+        @Override
+        public Object getNullValue()
+        {
+            return Double.valueOf(0d);
+        }
+        
+        @Override
+        public Object getMinValue()
+        {
+            return Double.valueOf(0d);
+        }
+
+        @Override
+        public Object getMaxValue()
+        {
+            return Double.valueOf(100d);
+        }
+
         @Override
         public Object compute(ROI roi, Sequence sequence) throws UnsupportedOperationException, InterruptedException
         {