diff --git a/rtengine/improcfun.h b/rtengine/improcfun.h
index 9de16db00..3f9fec910 100644
--- a/rtengine/improcfun.h
+++ b/rtengine/improcfun.h
@@ -26,6 +26,9 @@
 #include "pipettebuffer.h"
 #include "shmap.h"
 #include "array2D.h"
+
+#include <cairomm/cairomm.h>
+
 template<typename T>
 class LUT;
 
@@ -92,6 +95,7 @@ class ImProcFunctions
 {
     cmsHTRANSFORM monitorTransform;
     std::unique_ptr<GamutWarning> gamutWarning;
+    Cairo::RefPtr<Cairo::ImageSurface> locImage;
 
     const procparams::ProcParams* params;
     double scale;
diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index c54196ad6..f2b60b2f5 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -12529,7 +12529,18 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                                     }
                                 }
                             }
-
+                            //test for write text , now it compile... but does nothing
+                            // why ?? is arial found (I tried others) or I missed something
+                            /*
+                            locImage = Cairo::ImageSurface::create(Cairo::FORMAT_RGB24, bfw, bfh);
+                            Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create(locImage);
+                            cr->set_source_rgb(0.1, 0.1, 0.1);
+                            cr->select_font_face ("Arial", Cairo::FontSlant::FONT_SLANT_NORMAL, Cairo::FontWeight::FONT_WEIGHT_BOLD);
+                            cr->set_font_size (20);
+                            cr->move_to (20, 20);
+                            cr->show_text ("Coucou");  
+                            printf("OK \n");
+                            */
                             JaggedArray<float> blend(bfw, bfh);
                             buildBlendMask(lumreserv, blend, bfw, bfh, conthr, 1.f);
                             float rm = 20.f / sk;
@@ -12588,8 +12599,8 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                                 }
 
 
-                                //  if (conthr > 0.f && lp.mergemet != 4) {
-                                if (conthr > 0.f) {
+                                if (conthr > 0.f && lp.mergemet != 4) {
+                            //    if (conthr > 0.f) {
 
 #ifdef _OPENMP
                                     #pragma omp parallel for schedule(dynamic,16)
@@ -12695,8 +12706,8 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                                     }
                                 }
 
-                                if (conthr > 0.f) {
-                                    //   if (conthr > 0.f && lp.mergemet != 4) {
+                               // if (conthr > 0.f) {
+                                if (conthr > 0.f && lp.mergemet != 4) {
 #ifdef _OPENMP
                                     #pragma omp parallel for schedule(dynamic,16)
 #endif
@@ -13063,7 +13074,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                                 delete tmpImageorig;
                                 delete tmpImagereserv;
 
-                                if (conthr > 0.f) {
+                                if (conthr > 0.f && lp.mergemet != 4) {
 #ifdef _OPENMP
                                     #pragma omp parallel for schedule(dynamic,16)
 #endif
diff --git a/rtgui/locallab.cc b/rtgui/locallab.cc
index 939288c39..ea087b10e 100644
--- a/rtgui/locallab.cc
+++ b/rtgui/locallab.cc
@@ -5534,7 +5534,7 @@ void Locallab::merMethodChanged()
 {
     if (merMethod->get_active_row_number() == 0) {
         mask7->hide();
-//        conthrcol->hide();
+        conthrcol->hide();
         sensi->set_sensitive(true);
         structcol->set_sensitive(true);
         blurcolde->set_sensitive(true);
@@ -5552,7 +5552,7 @@ void Locallab::merMethodChanged()
         rgbCurveEditorG->set_sensitive(true);
         special->set_sensitive(true);
         invers->set_sensitive(true);
-//        conthrcol->hide();
+        conthrcol->hide();
         gridmerFrame->hide();
     } else if (merMethod->get_active_row_number() == 2) {
         mask7->show();
@@ -5563,7 +5563,7 @@ void Locallab::merMethodChanged()
         rgbCurveEditorG->set_sensitive(false);
         special->set_sensitive(false);
         invers->set_sensitive(false);
- //       conthrcol->show();
+        conthrcol->show();
         gridmerFrame->hide();
     } else if (merMethod->get_active_row_number() == 3) {
         sensi->set_sensitive(false);
@@ -5574,11 +5574,11 @@ void Locallab::merMethodChanged()
         special->set_sensitive(false);
         invers->set_sensitive(false);
         mask7->show();
-//        conthrcol->show();
+        conthrcol->show();
         gridmerFrame->hide();
     } else if (merMethod->get_active_row_number() == 4) {
         mask7->show();
-//        conthrcol->hide();
+        conthrcol->hide();
         blurcolde->set_sensitive(false);
         sensi->set_sensitive(false);
         structcol->set_sensitive(false);
@@ -10317,7 +10317,7 @@ void Locallab::updateSpecificGUIState()
 
     if (merMethod->get_active_row_number() == 0) {
         mask7->hide();
-//        conthrcol->hide();
+        conthrcol->hide();
         structcol->set_sensitive(true);
         sensi->set_sensitive(true);
         blurcolde->set_sensitive(true);
@@ -10335,7 +10335,7 @@ void Locallab::updateSpecificGUIState()
         rgbCurveEditorG->set_sensitive(true);
         special->set_sensitive(true);
         invers->set_sensitive(true);
-//        conthrcol->hide();
+        conthrcol->hide();
         gridmerFrame->hide();
     } else if (merMethod->get_active_row_number() == 2) {
         mask7->show();
@@ -10346,10 +10346,10 @@ void Locallab::updateSpecificGUIState()
         rgbCurveEditorG->set_sensitive(false);
         special->set_sensitive(false);
         invers->set_sensitive(false);
-//        conthrcol->show();
+        conthrcol->show();
         gridmerFrame->hide();
     } else if (merMethod->get_active_row_number() == 3) {
-//        conthrcol->show();
+        conthrcol->show();
         structcol->set_sensitive(false);
         sensi->set_sensitive(false);
         blurcolde->set_sensitive(false);
@@ -10368,7 +10368,7 @@ void Locallab::updateSpecificGUIState()
         rgbCurveEditorG->set_sensitive(false);
         special->set_sensitive(false);
         invers->set_sensitive(false);
-//        conthrcol->hide();
+        conthrcol->hide();
         gridmerFrame->show();
     }