diff --git a/rtdata/languages/default b/rtdata/languages/default
index b96bf1c38..ae48a0156 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -1974,7 +1974,7 @@ TP_LOCALLAB_EXNORM;Normal spot
 TP_LOCALLAB_EXECLU;Excluding spot
 TP_LOCALLAB_EXPOSE;Exposure
 TP_LOCALLAB_LOC_CONTRAST;Local contrast
-TP_LOCALLAB_REFLABEL;Reference (0..1) Luma=%1 Chroma=%2
+TP_LOCALLAB_REFLABEL;Reference (0..1) Chroma=%1 Luma=%2
 TP_LOCALLAB_NOISELUMFINE;Luminance fine (Wav)
 TP_LOCALLAB_NOISELUMCOARSE;Luminance coarse (Wav)
 TP_LOCALLAB_NOISELUMDETAIL;Luminance detail (DCT)
@@ -2029,7 +2029,7 @@ TP_LOCALLAB_SENSIBN;Scope
 TP_LOCALLAB_SENSIS_TOOLTIP;Adjust scope of action:\nSmall values limit action to colors very similar to those under the center spot.\nHigh values let the tool act upon a wider range of colors.\nValues smaller than 20 lead to a better algorithm.
 TP_LOCALLAB_SETTINGS;Settings
 TP_LOCALLAB_SHOW;Mask and modifications
-TP_LOCALLAB_SHOWMASKCOL_TOOLTIP;Display modifications.\nBeware, you can only view one modification (color and light or Exposure).\nYou must put 'Show modification' to none to enabled the other show.\n\nUse Mask is before algorihtm shape detection  
+TP_LOCALLAB_SHOWMASKCOL_TOOLTIP;Display modifications.\nBeware, you can only view one modification (color and light or Exposure).\nYou must put 'Display modification' to 'none' or 'Usemask' to enabled the other show.\n\nUse Mask is before algorihtm shape detection  
 TP_LOCALLAB_SHOWMNONE;None
 TP_LOCALLAB_SHOWMODIF;Show modifications whithout mask
 TP_LOCALLAB_SHOWMODIFMASK;Show modifications whith mask
diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index 440b2a088..fc60f6b08 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -10884,13 +10884,13 @@ void ImProcFunctions::Lab_Local(int call, int sp, LUTf & sobelrefs, float** shbu
 
                                 if (locccmasCurve) {
                                     float chromask = (sqrt(SQR(bufcolorig->a[loy - begy][lox - begx]) + SQR(bufcolorig->b[loy - begy][lox - begx])));
-                                    float chromaskr = chromask / 50000.f;
+                                    float chromaskr = chromask / 45000.f;
                                     valCC = float (locccmasCurve[500.f *  chromaskr]);
                                     valCC = 1.f - valCC;
                                     sincosval.y = (bufcolorig->a[loy - begy][lox - begx]) / chromask;
                                     sincosval.x = (bufcolorig->b[loy - begy][lox - begx]) / chromask;
-                                    bufmaskblur->a[loy - begy][lox - begx] = 50000.f * valCC * sincosval.y;
-                                    bufmaskblur->b[loy - begy][lox - begx] = 50000.f * valCC * sincosval.x;
+                                    bufmaskblur->a[loy - begy][lox - begx] = 45000.f * valCC * sincosval.y;
+                                    bufmaskblur->b[loy - begy][lox - begx] = 45000.f * valCC * sincosval.x;
                                 }
                             }
                         }
@@ -11231,13 +11231,13 @@ void ImProcFunctions::Lab_Local(int call, int sp, LUTf & sobelrefs, float** shbu
 
                                 if (locccmasexpCurve) {
                                     float chromask = (sqrt(SQR(bufexporig->a[loy - begy][lox - begx]) + SQR(bufexporig->b[loy - begy][lox - begx])));
-                                    float chromaskr = chromask / 50000.f;
+                                    float chromaskr = chromask / 45000.f;
                                     valCC = float (locccmasexpCurve[500.f *  chromaskr]);
                                     valCC = 1.f - valCC;
                                     sincosval.y = (bufexporig->a[loy - begy][lox - begx]) / chromask;
                                     sincosval.x = (bufexporig->b[loy - begy][lox - begx]) / chromask;
-                                    bufmaskblur->a[loy - begy][lox - begx] = 50000.f * valCC * sincosval.y;
-                                    bufmaskblur->b[loy - begy][lox - begx] = 50000.f * valCC * sincosval.x;
+                                    bufmaskblur->a[loy - begy][lox - begx] = 45000.f * valCC * sincosval.y;
+                                    bufmaskblur->b[loy - begy][lox - begx] = 45000.f * valCC * sincosval.x;
                                 }
                             }
                         }
diff --git a/rtgui/locallab.cc b/rtgui/locallab.cc
index bf1a14656..84dc4af1f 100644
--- a/rtgui/locallab.cc
+++ b/rtgui/locallab.cc
@@ -906,7 +906,7 @@ void Locallab::refChanged (double huer, double lumar, double chromar)
 {
     nexthuer = huer;
     nextlumar = lumar / 100.f;
-    nextchromar = chromar / 152.f;
+    nextchromar = chromar / 137.4f;
     //printf("nh=%f nl=%f nc=%f\n", nexthuer, nextlumar, nextchromar);
     const auto func = [] (gpointer data) -> gboolean {
         GThreadLock lock; // All GUI access from idle_add callbacks or separate thread HAVE to be protected
@@ -932,8 +932,8 @@ void Locallab::updateLabel ()
     if (!batchMode) {
         float nX, nY;
         
-        nX = nextlumar;
-        nY = nextchromar;
+        nY = nextlumar;
+        nX = nextchromar;
         {
             transLabels->set_text (
                 Glib::ustring::compose (M ("TP_LOCALLAB_REFLABEL"),
@@ -3829,14 +3829,14 @@ void Locallab::updateSpecificGUIState()
     //update showmethod
     if (multiImage && showmaskcolMethod->get_active_text() == M("GENERAL_UNCHANGED")) {
         showmaskexpMethod->set_active(0);
-    } else if(showmaskcolMethod->get_active_row_number() == 1) {
+    } else if((showmaskcolMethod->get_active_row_number() == 1 || showmaskcolMethod->get_active_row_number() == 2 || showmaskcolMethod->get_active_row_number() == 4)) {
         showmaskexpMethod->set_active(0);
         expexpose->setEnabled(false); 
     }
     
     if (multiImage && showmaskexpMethod->get_active_text() == M("GENERAL_UNCHANGED")) {
         showmaskcolMethod->set_active(0);
-    } else if(showmaskexpMethod->get_active_row_number() == 1) {
+    } else if((showmaskexpMethod->get_active_row_number() == 1 || showmaskexpMethod->get_active_row_number() == 2 || showmaskexpMethod->get_active_row_number() == 4)) {
         showmaskcolMethod->set_active(0);
         expcolor->setEnabled(false); 
     }