diff --git a/rtdata/languages/default b/rtdata/languages/default
index 56fede0f9..76396e1ee 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -348,6 +348,12 @@ NAVIGATOR_S_NA;S = n/a
 NAVIGATOR_S_VALUE;S = %1
 NAVIGATOR_V_NA;V = n/a
 NAVIGATOR_V_VALUE;V = %1
+NAVIGATOR_LAB_A_NA;A = n/a
+NAVIGATOR_LAB_A_VALUE;A = %1
+NAVIGATOR_LAB_B_NA;B = n/a
+NAVIGATOR_LAB_B_VALUE;B = %1
+NAVIGATOR_LAB_L_NA;L = n/a
+NAVIGATOR_LAB_L_VALUE;L = %1
 NAVIGATOR_XY_NA;x = n/a, y = n/a
 PARTIALPASTE_BASICGROUP;Basic settings
 PARTIALPASTE_CACORRECTION;C/A correction
diff --git a/rtgui/navigator.cc b/rtgui/navigator.cc
index c65f4530a..cda896052 100644
--- a/rtgui/navigator.cc
+++ b/rtgui/navigator.cc
@@ -34,14 +34,20 @@ Navigator::Navigator () {
 	H = Gtk::manage (new Gtk::Label ());
 	S = Gtk::manage (new Gtk::Label ());
 	V = Gtk::manage (new Gtk::Label ());
+	LAB_A = Gtk::manage (new Gtk::Label ());
+	LAB_B = Gtk::manage (new Gtk::Label ());
+	LAB_L = Gtk::manage (new Gtk::Label ());
 
-    Gtk::Table* table = new Gtk::Table (3, 2);
+    Gtk::Table* table = new Gtk::Table (3, 3);
     table->attach (*R, 0, 1, 0, 1, Gtk::EXPAND, Gtk::SHRINK, 0, 0);
     table->attach (*G, 0, 1, 1, 2, Gtk::EXPAND, Gtk::SHRINK, 0, 0);
     table->attach (*B, 0, 1, 2, 3, Gtk::EXPAND, Gtk::SHRINK, 0, 0);
     table->attach (*H, 1, 2, 0, 1, Gtk::EXPAND, Gtk::SHRINK, 0, 0);
     table->attach (*S, 1, 2, 1, 2, Gtk::EXPAND, Gtk::SHRINK, 0, 0);
     table->attach (*V, 1, 2, 2, 3, Gtk::EXPAND, Gtk::SHRINK, 0, 0);
+    table->attach (*LAB_L, 2, 3, 0, 1, Gtk::EXPAND, Gtk::SHRINK, 0, 0);
+    table->attach (*LAB_A, 2, 3, 1, 2, Gtk::EXPAND, Gtk::SHRINK, 0, 0);
+    table->attach (*LAB_B, 2, 3, 2, 3, Gtk::EXPAND, Gtk::SHRINK, 0, 0);
 
 	mbox->pack_start (*table, Gtk::PACK_SHRINK, 2);
 	
@@ -60,6 +66,9 @@ void Navigator::setInvalid () {
 	H->set_text (M("NAVIGATOR_H_NA"));
 	S->set_text (M("NAVIGATOR_S_NA"));
 	V->set_text (M("NAVIGATOR_V_NA"));
+	LAB_A->set_text (M("NAVIGATOR_LAB_A_NA"));
+	LAB_B->set_text (M("NAVIGATOR_LAB_B_NA"));
+	LAB_L->set_text (M("NAVIGATOR_LAB_L_NA"));
 }
 
 void Navigator::pointerMoved (bool validPos, int x, int y, int r, int g, int b) {
@@ -76,6 +85,12 @@ void Navigator::pointerMoved (bool validPos, int x, int y, int r, int g, int b)
 		H->set_text (Glib::ustring::compose (M("NAVIGATOR_H_VALUE"), h));
 		S->set_text (Glib::ustring::compose (M("NAVIGATOR_S_VALUE"), s));
 		V->set_text (Glib::ustring::compose (M("NAVIGATOR_V_VALUE"), v));
+		int LAB_a, LAB_b, LAB_l;
+		rgb2lab (r, g, b, LAB_l, LAB_a, LAB_b);
+		LAB_A->set_text (Glib::ustring::compose (M("NAVIGATOR_LAB_A_VALUE"), LAB_a));
+		LAB_B->set_text (Glib::ustring::compose (M("NAVIGATOR_LAB_B_VALUE"), LAB_b));
+		LAB_L->set_text (Glib::ustring::compose (M("NAVIGATOR_LAB_L_VALUE"), LAB_l));
+
 	}
 }
 
@@ -113,3 +128,49 @@ void Navigator::rgb2hsv (int r, int g, int b, int &h, int &s, int &v) {
     s = (int)(S*255.0);
     v = (int)(V*255.0);
 }
+
+void Navigator::rgb2lab (int r, int g, int b, int &LAB_l, int &LAB_a, int &LAB_b) {
+
+	volatile double var_R = r / 255.0;
+	volatile double var_G = g / 255.0;
+	volatile double var_B = b / 255.0;
+
+	if ( var_R > 0.04045 ) 
+		var_R = pow ( ( ( var_R + 0.055 ) / 1.055 ), 2.4);
+	else    
+		var_R = var_R / 12.92;
+	if ( var_G > 0.04045 ) 
+		var_G = pow ( ( ( var_G + 0.055 ) / 1.055 ), 2.4);
+	else                   
+		var_G = var_G / 12.92;
+	if ( var_B > 0.04045 ) 
+		var_B = pow ( ( ( var_B + 0.055 ) / 1.055 ), 2.4);
+	else    
+		var_B = var_B / 12.92;
+
+	var_R = var_R * 100;
+	var_G = var_G * 100;
+	var_B = var_B * 100;
+
+	double var_X = ( var_R * 0.4124 + var_G * 0.3576 + var_B * 0.1805 ) / 95.047;
+	double var_Y = ( var_R * 0.2126 + var_G * 0.7152 + var_B * 0.0722 ) / 100.000;
+	double var_Z = ( var_R * 0.0193 + var_G * 0.1192 + var_B * 0.9505 ) / 108.883;
+
+	if ( var_X > 0.008856 ) 
+		var_X = pow (var_X, ( 1.0/3.0 ));
+	else
+		var_X = ( 7.787 * var_X ) + ( 16.0 / 116.0 );
+	if ( var_Y > 0.008856 ) 
+		var_Y = pow (var_Y, ( 1.0/3.0 ));
+	else 
+		var_Y = ( 7.787 * var_Y ) + ( 16.0 / 116.0 );
+	if ( var_Z > 0.008856 ) 
+		var_Z = pow (var_Z, ( 1.0/3.0 ));
+	else  
+		var_Z = ( 7.787 * var_Z ) + ( 16.0 / 116.0 );
+
+	LAB_l = ( 116 * var_Y ) - 16;
+	LAB_a = 500 * ( var_X - var_Y );
+	LAB_b = 200 * ( var_Y - var_Z );
+
+}
diff --git a/rtgui/navigator.h b/rtgui/navigator.h
index 27220ada2..0c94c31db 100644
--- a/rtgui/navigator.h
+++ b/rtgui/navigator.h
@@ -29,8 +29,10 @@ class Navigator : public Gtk::Frame, public PointerMotionListener {
 		Gtk::Label* position;
 		Gtk::Label *R, *G, *B;
 		Gtk::Label *H, *S, *V;
+		Gtk::Label *LAB_A, *LAB_B, *LAB_L;
 
 		void rgb2hsv 	(int r, int g, int b, int &h, int &s, int &v);
+		void rgb2lab (int r, int g, int b, int &LAB_l, int &LAB_a, int &LAB_b);
 		void setInvalid ();
 	public:
 		PreviewWindow* previewWindow;