diff --git a/gs-cv/src/main/java/org/genericsystem/cv/ClassImgFieldsDetector.java b/gs-cv/src/main/java/org/genericsystem/cv/ClassImgFieldsDetector.java
index 5c991bce0..03341a1af 100644
--- a/gs-cv/src/main/java/org/genericsystem/cv/ClassImgFieldsDetector.java
+++ b/gs-cv/src/main/java/org/genericsystem/cv/ClassImgFieldsDetector.java
@@ -3,13 +3,13 @@
 import java.io.File;
 import java.util.stream.Stream;
 
-import javafx.scene.layout.GridPane;
-
 import org.opencv.core.Core;
 import org.opencv.core.Scalar;
 import org.opencv.core.Size;
 import org.opencv.imgcodecs.Imgcodecs;
 
+import javafx.scene.layout.GridPane;
+
 public class ClassImgFieldsDetector extends AbstractApp {
 	static {
 		System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
@@ -30,8 +30,6 @@ protected void fillGrid(GridPane mainGrid) {
 		mainGrid.add(imgClass.getMean().getImageView(), columnIndex, rowIndex++);
 		mainGrid.add(imgClass.getVariance().getImageView(), columnIndex, rowIndex++);
 
-		// imgClass.addMapper(img -> img.eraseCorners(0.1).dilateBlacks(86, 255,
-		// 76, new Size(20, 3)));
 		// mainGrid.add(imgClass.getMean().getImageView(), columnIndex,
 		// rowIndex++);
 		// mainGrid.add(imgClass.getVariance().getImageView(), columnIndex,
@@ -54,6 +52,7 @@ protected void fillGrid(GridPane mainGrid) {
 			zones = Zones.load(imgClassDirectory);
 		} catch (RuntimeException e) {
 			System.out.println("could not load accurate zones");
+			imgClass.addMapper(img -> img.eraseCorners(0.1).dilateBlacks(86, 255, 76, new Size(20, 3)));
 			zones = Zones.get(imgClass.getClosedVarianceZones(new Size(9, 10)), 300, 6, 6);
 		}
 		Img model = imgClass.getMean();
@@ -65,7 +64,6 @@ protected void fillGrid(GridPane mainGrid) {
 				System.out.println("File : " + file.getName());
 				if (i++ > 3)
 					continue;
-				// System.out.println("File : " + file.getName());
 				Img img = new Img(Imgcodecs.imread(file.getPath()));
 				for (Zone zone : zones) {
 					System.out.println("Zone n°" + zone.getNum());
@@ -84,4 +82,3 @@ protected void fillGrid(GridPane mainGrid) {
 			}
 	}
 }
-
diff --git a/gs-cv/src/main/java/org/genericsystem/cv/Img.java b/gs-cv/src/main/java/org/genericsystem/cv/Img.java
index 3798d26a3..e071f1e69 100644
--- a/gs-cv/src/main/java/org/genericsystem/cv/Img.java
+++ b/gs-cv/src/main/java/org/genericsystem/cv/Img.java
@@ -430,7 +430,7 @@ public Img otsuInv() {
 	}
 
 	public Img dilateBlacks(double valueThreshold, double saturatioThreshold, double blueThreshold, Size dilatation) {
-		return range(new Scalar(0, 0, 0), new Scalar(255, saturatioThreshold, valueThreshold), true).range(new Scalar(0, 0, 0), new Scalar(blueThreshold, 255, 255), false).gray().morphologyEx(Imgproc.MORPH_DILATE, Imgproc.MORPH_RECT, dilatation);
+		return range(new Scalar(0, 0, 0), new Scalar(255, saturatioThreshold, valueThreshold), true).range(new Scalar(0, 0, 0), new Scalar(blueThreshold, 255, 255), false).morphologyEx(Imgproc.MORPH_DILATE, Imgproc.MORPH_RECT, dilatation);
 	}
 
 	public Img equalizeHisto() {
diff --git a/gs-cv/src/main/java/org/genericsystem/cv/Zones.java b/gs-cv/src/main/java/org/genericsystem/cv/Zones.java
index 91ea0bca0..570209d73 100644
--- a/gs-cv/src/main/java/org/genericsystem/cv/Zones.java
+++ b/gs-cv/src/main/java/org/genericsystem/cv/Zones.java
@@ -117,7 +117,6 @@ public static Zones load(File file) {
 		try {
 			return mapper.readValue(file, Zones.class);
 		} catch (IOException e) {
-			e.printStackTrace();
 			throw new RuntimeException(e);
 		}
 	}