diff --git a/jlatexmath-example-export/src/test/java/org/scilab/forge/jlatexmath/examples/export/ExamplesTest.java b/jlatexmath-example-export/src/test/java/org/scilab/forge/jlatexmath/examples/export/ExamplesTest.java
index 4525ad13..09f806fe 100644
--- a/jlatexmath-example-export/src/test/java/org/scilab/forge/jlatexmath/examples/export/ExamplesTest.java
+++ b/jlatexmath-example-export/src/test/java/org/scilab/forge/jlatexmath/examples/export/ExamplesTest.java
@@ -46,7 +46,6 @@
 
 import static org.junit.Assert.assertTrue;
 
-import java.awt.Color;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.FileInputStream;
@@ -64,6 +63,7 @@
 import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runners.MethodSorters;
+import org.scilab.forge.jlatexmath.internal.util.Images;
 
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
 public class ExamplesTest {
@@ -157,11 +157,11 @@ private static void check(String filename) {
             System.out.println("checking image " + filename);
             BufferedImage a = ImageIO.read(new File("src/test/resources/expected/" + filename));
             BufferedImage b = ImageIO.read(new File("target/" + filename));
-            double distance = distance(a, b);
+            double distance = Images.distance(a, b);
             System.out.println("distance=" + distance);
             // TODO establish a reasonable threshold after running the tests on
             // different platforms (windows, osx, linux, others?)
-            double THRESHOLD = 40;
+            final double THRESHOLD = Images.DISTANCE_THRESHOLD;
             assertTrue("actual and expected images for " + filename + " are different sizes!",
                     distance >= 0);
             assertTrue("distance is above threshold, images are probably significantly different, distance="
@@ -172,33 +172,4 @@ private static void check(String filename) {
         }
     }
 
-    private static double distance(BufferedImage imgA, BufferedImage imgB) {
-        // The images must be the same size.
-        if (imgA.getWidth() == imgB.getWidth() && imgA.getHeight() == imgB.getHeight()) {
-            int width = imgA.getWidth();
-            int height = imgA.getHeight();
-
-            double mse = 0;
-            // Loop over every pixel.
-            for (int y = 0; y < height; y++) {
-                for (int x = 0; x < width; x++) {
-                    Color ca = new Color(imgA.getRGB(x, y));
-                    Color cb = new Color(imgB.getRGB(x, y));
-                    double variance = sqr(ca.getRed() - cb.getRed()) //
-                            + sqr(ca.getBlue() - cb.getBlue()) //
-                            + sqr(ca.getGreen() - cb.getGreen()) //
-                            + sqr(ca.getAlpha() - cb.getAlpha());
-                    mse += variance;
-                }
-            }
-            return Math.sqrt(mse / height / width);
-        } else {
-            return -1;
-        }
-    }
-
-    private static double sqr(double x) {
-        return x * x;
-    }
-
 }
diff --git a/jlatexmath/src/main/java/org/scilab/forge/jlatexmath/internal/util/Images.java b/jlatexmath/src/main/java/org/scilab/forge/jlatexmath/internal/util/Images.java
new file mode 100644
index 00000000..2786c381
--- /dev/null
+++ b/jlatexmath/src/main/java/org/scilab/forge/jlatexmath/internal/util/Images.java
@@ -0,0 +1,44 @@
+package org.scilab.forge.jlatexmath.internal.util;
+
+import java.awt.Color;
+import java.awt.image.BufferedImage;
+
+public final class Images {
+
+    private Images() {
+        //prevent instantiation
+    }
+    
+    public static double DISTANCE_THRESHOLD=40;
+    
+    public static double distance(BufferedImage imgA, BufferedImage imgB) {
+        // The images must be the same size.
+        if (imgA.getWidth() == imgB.getWidth() && imgA.getHeight() == imgB.getHeight()) {
+            int width = imgA.getWidth();
+            int height = imgA.getHeight();
+
+            double mse = 0;
+            // Loop over every pixel.
+            for (int y = 0; y < height; y++) {
+                for (int x = 0; x < width; x++) {
+                    Color ca = new Color(imgA.getRGB(x, y));
+                    Color cb = new Color(imgB.getRGB(x, y));
+                    double variance = sqr(ca.getRed() - cb.getRed()) //
+                            + sqr(ca.getBlue() - cb.getBlue()) //
+                            + sqr(ca.getGreen() - cb.getGreen()) //
+                            + sqr(ca.getAlpha() - cb.getAlpha());
+                    mse += variance;
+                }
+            }
+            return Math.sqrt(mse / height / width);
+        } else {
+            return -1;
+        }
+    }
+
+    private static double sqr(double x) {
+        return x * x;
+    }
+
+    
+}
diff --git a/jlatexmath/src/test/java/org/scilab/forge/jlatexmath/examples/basic/ExamplesTest.java b/jlatexmath/src/test/java/org/scilab/forge/jlatexmath/examples/basic/ExamplesTest.java
index 5e716848..2c704b5e 100644
--- a/jlatexmath/src/test/java/org/scilab/forge/jlatexmath/examples/basic/ExamplesTest.java
+++ b/jlatexmath/src/test/java/org/scilab/forge/jlatexmath/examples/basic/ExamplesTest.java
@@ -46,7 +46,6 @@
 
 import static org.junit.Assert.assertTrue;
 
-import java.awt.Color;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.IOException;
@@ -54,6 +53,7 @@
 import javax.imageio.ImageIO;
 
 import org.junit.Test;
+import org.scilab.forge.jlatexmath.internal.util.Images;
 
 public class ExamplesTest {
 
@@ -98,46 +98,20 @@ private static void check(String filename) {
             System.out.println("checking image " + filename);
             BufferedImage a = ImageIO.read(new File("src/test/resources/expected/" + filename));
             BufferedImage b = ImageIO.read(new File("target/" + filename));
-            double distance = distance(a, b);
+            double distance = Images.distance(a, b);
             System.out.println("distance=" + distance);
             // TODO establish a reasonable threshold after running the tests on
             // different platforms (windows, osx, linux, others?) and different
             // jdks
-            double THRESHOLD = 40;
+            double THRESHOLD = Images.DISTANCE_THRESHOLD;
             assertTrue("actual and expected images for " + filename + " are different sizes!", distance >= 0);
-            assertTrue("distance is above threshold, images are probably significantly different, distance=" + distance,
+            assertTrue(
+                    "distance=" + distance + " is above threshold=" + THRESHOLD
+                            + ", images are probably significantly different, distance=" + distance,
                     distance <= THRESHOLD);
         } catch (IOException e) {
             throw new RuntimeException(e);
         }
     }
 
-    private static double distance(BufferedImage imgA, BufferedImage imgB) {
-        // The images must be the same size.
-        if (imgA.getWidth() == imgB.getWidth() && imgA.getHeight() == imgB.getHeight()) {
-            int width = imgA.getWidth();
-            int height = imgA.getHeight();
-
-            double mse = 0;
-            // Loop over every pixel.
-            for (int y = 0; y < height; y++) {
-                for (int x = 0; x < width; x++) {
-                    Color ca = new Color(imgA.getRGB(x, y));
-                    Color cb = new Color(imgB.getRGB(x, y));
-                    double variance = sqr(ca.getRed() - cb.getRed()) //
-                            + sqr(ca.getBlue() - cb.getBlue()) //
-                            + sqr(ca.getGreen() - cb.getGreen()) //
-                            + sqr(ca.getAlpha() - cb.getAlpha());
-                    mse += variance;
-                }
-            }
-            return Math.sqrt(mse / height / width);
-        } else {
-            return -1;
-        }
-    }
-
-    private static double sqr(double x) {
-        return x * x;
-    }
-}
+}
\ No newline at end of file