diff --git a/rtdata/languages/default b/rtdata/languages/default
index fff23ff8d..f2c31a1c8 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -1013,6 +1013,7 @@ HISTORY_MSG_772;Local - SH Mask contrast curve
 HISTORY_MSG_773;Local - TM Mask contrast curve
 HISTORY_MSG_774;Local - Reti Mask contrast curve
 HISTORY_MSG_775;Local - CBDL Mask contrast curve
+HISTORY_MSG_776;Local - Blur Denoise Mask contrast curve
 HISTORY_MSG_CLAMPOOG;Clip out-of-gamut colors
 HISTORY_MSG_COLORTONING_LABGRID_VALUE;CT - Color correction
 HISTORY_MSG_COLORTONING_LABREGION_AB;CT - Color correction
diff --git a/rtengine/dcrop.cc b/rtengine/dcrop.cc
index e17693389..bad345669 100644
--- a/rtengine/dcrop.cc
+++ b/rtengine/dcrop.cc
@@ -892,12 +892,14 @@ void Crop::update(int todo)
         bool localmasktmutili = parent->localmasktmutili;
         bool localmaskretiutili = parent->localmaskretiutili;
         bool localmaskcbutili = parent->localmaskcbutili;
+        bool localmaskblutili = parent->localmaskblutili;
         LUTf lmasklocalcurve2(65536, 0);
         LUTf lmaskexplocalcurve2(65536, 0);
         LUTf lmaskSHlocalcurve2(65536, 0);
         LUTf lmasktmlocalcurve2(65536, 0);
         LUTf lmaskretilocalcurve2(65536, 0);
         LUTf lmaskcblocalcurve2(65536, 0);
+        LUTf lmaskbllocalcurve2(65536, 0);
         LUTf hltonecurveloc2(65536, 0); //65536
         LUTf shtonecurveloc2(65536, 0);
         LUTf tonecurveloc2(65536, 0);
@@ -1009,6 +1011,8 @@ void Crop::update(int todo)
                 CurveFactory::curvemaskLocal(localmaskretiutili, params.locallab.spots.at(sp).Lmaskreticurve, lmaskretilocalcurve2, sca);
                 localmaskcbutili = false;
                 CurveFactory::curvemaskLocal(localmaskcbutili, params.locallab.spots.at(sp).Lmaskcbcurve, lmaskcblocalcurve2, sca);
+                localmaskblutili = false;
+                CurveFactory::curvemaskLocal(localmaskblutili, params.locallab.spots.at(sp).Lmaskblcurve, lmaskbllocalcurve2, sca);
 
 
                 double ecomp = params.locallab.spots.at(sp).expcomp;
@@ -1053,6 +1057,7 @@ void Crop::update(int todo)
                             lmasktmlocalcurve2, localmasktmutili, 
                             lmaskretilocalcurve2, localmaskretiutili, 
                             lmaskcblocalcurve2, localmaskcbutili, 
+                            lmaskbllocalcurve2, localmaskblutili, 
                             locccmasCurve, lcmasutili, locllmasCurve, llmasutili, lochhmasCurve, lhmasutili, locccmasexpCurve, lcmasexputili, locllmasexpCurve, llmasexputili, lochhmasexpCurve, lhmasexputili,
                             locccmasSHCurve, lcmasSHutili, locllmasSHCurve, llmasSHutili, lochhmasSHCurve, lhmasSHutili,
                             locccmascbCurve, lcmascbutili, locllmascbCurve, llmascbutili, lochhmascbCurve, lhmascbutili,
@@ -1076,6 +1081,7 @@ void Crop::update(int todo)
                             lmasktmlocalcurve2, localmasktmutili, 
                             lmaskretilocalcurve2, localmaskretiutili, 
                             lmaskcblocalcurve2, localmaskcbutili, 
+                            lmaskbllocalcurve2, localmaskblutili, 
                             locccmasCurve, lcmasutili, locllmasCurve, llmasutili, lochhmasCurve, lhmasutili, locccmasexpCurve, lcmasexputili, locllmasexpCurve, llmasexputili, lochhmasexpCurve, lhmasexputili, 
                             locccmasSHCurve, lcmasSHutili, locllmasSHCurve, llmasSHutili, lochhmasSHCurve, lhmasSHutili,
                             locccmascbCurve, lcmascbutili, locllmascbCurve, llmascbutili, lochhmascbCurve, lhmascbutili,
@@ -1097,6 +1103,7 @@ void Crop::update(int todo)
                 lmasktmlocalcurve2.clear();
                 lmaskretilocalcurve2.clear();
                 lmaskcblocalcurve2.clear();
+                lmaskbllocalcurve2.clear();
                 hltonecurveloc2.clear();
                 shtonecurveloc2.clear();
                 tonecurveloc2.clear();
diff --git a/rtengine/improccoordinator.cc b/rtengine/improccoordinator.cc
index 01d7e0976..ce0eca227 100644
--- a/rtengine/improccoordinator.cc
+++ b/rtengine/improccoordinator.cc
@@ -177,6 +177,7 @@ ImProcCoordinator::ImProcCoordinator() :
     lmasktmlocalcurve(65536, 0),
     lmaskretilocalcurve(65536, 0),
     lmaskcblocalcurve(65536, 0),
+    lmaskbllocalcurve(65536, 0),
     locallutili(false), 
     localcutili(false), 
     localexutili(false),
@@ -189,6 +190,7 @@ ImProcCoordinator::ImProcCoordinator() :
     localmasktmutili(false),
     localmaskretiutili(false),
     localmaskcbutili(false),
+    localmaskblutili(false),
     lcmasexputili(false),
     lhmasexputili(false),
     llmasexputili(false),
@@ -935,6 +937,7 @@ void ImProcCoordinator::updatePreviewImage(int todo, bool panningRelatedChange)
                 localmasktmutili = false;
                 localmaskretiutili = false;
                 localmaskcbutili = false;
+                localmaskblutili = false;
                 lcmasSHutili = false;
                 lhmasSHutili = false;
                 llmasSHutili = false;
@@ -988,6 +991,7 @@ void ImProcCoordinator::updatePreviewImage(int todo, bool panningRelatedChange)
                 CurveFactory::curvemaskLocal(localmasktmutili, params->locallab.spots.at(sp).Lmasktmcurve, lmasktmlocalcurve, sca);
                 CurveFactory::curvemaskLocal(localmaskretiutili, params->locallab.spots.at(sp).Lmaskreticurve, lmaskretilocalcurve, sca);
                 CurveFactory::curvemaskLocal(localmaskcbutili, params->locallab.spots.at(sp).Lmaskcbcurve, lmaskcblocalcurve, sca);
+                CurveFactory::curvemaskLocal(localmaskblutili, params->locallab.spots.at(sp).Lmaskblcurve, lmaskbllocalcurve, sca);
                 double ecomp = params->locallab.spots.at(sp).expcomp;
                 double black = params->locallab.spots.at(sp).black;
                 double hlcompr = params->locallab.spots.at(sp).hlcompr;
@@ -1047,6 +1051,7 @@ void ImProcCoordinator::updatePreviewImage(int todo, bool panningRelatedChange)
                                 lmasktmlocalcurve, localmasktmutili,
                                 lmaskretilocalcurve, localmaskretiutili,
                                 lmaskcblocalcurve, localmaskcbutili,
+                                lmaskbllocalcurve, localmaskblutili,
                                 locccmasCurve, lcmasutili, locllmasCurve, llmasutili, lochhmasCurve, lhmasutili, locccmasexpCurve, lcmasexputili, locllmasexpCurve, llmasexputili, lochhmasexpCurve, lhmasexputili,
                                 locccmasSHCurve, lcmasSHutili, locllmasSHCurve, llmasSHutili, lochhmasSHCurve, lhmasSHutili,
                                 locccmascbCurve, lcmascbutili, locllmascbCurve, llmascbutili, lochhmascbCurve, lhmascbutili,
@@ -1069,6 +1074,7 @@ void ImProcCoordinator::updatePreviewImage(int todo, bool panningRelatedChange)
                                 lmasktmlocalcurve, localmasktmutili,
                                 lmaskretilocalcurve, localmaskretiutili,
                                 lmaskcblocalcurve, localmaskcbutili,
+                                lmaskbllocalcurve, localmaskblutili,
                                 locccmasCurve, lcmasutili, locllmasCurve, llmasutili, lochhmasCurve, lhmasutili, locccmasexpCurve, lcmasexputili, locllmasexpCurve, llmasexputili, lochhmasexpCurve, lhmasexputili,
                                 locccmasSHCurve, lcmasSHutili, locllmasSHCurve, llmasSHutili, lochhmasSHCurve, lhmasSHutili,
                                 locccmascbCurve, lcmascbutili, locllmascbCurve, llmascbutili, lochhmascbCurve, lhmascbutili,
@@ -1097,6 +1103,7 @@ void ImProcCoordinator::updatePreviewImage(int todo, bool panningRelatedChange)
                 lmasktmlocalcurve.clear();
                 lmaskretilocalcurve.clear();
                 lmaskcblocalcurve.clear();
+                lmaskbllocalcurve.clear();
                 hltonecurveloc.clear();
                 shtonecurveloc.clear();
                 tonecurveloc.clear();
diff --git a/rtengine/improccoordinator.h b/rtengine/improccoordinator.h
index 70ea40fe9..031742103 100644
--- a/rtengine/improccoordinator.h
+++ b/rtengine/improccoordinator.h
@@ -239,6 +239,7 @@ protected:
     LUTf lmasktmlocalcurve;
     LUTf lmaskretilocalcurve;
     LUTf lmaskcblocalcurve;
+    LUTf lmaskbllocalcurve;
 //    LUTu lhist16loc;
     LocretigainCurve locRETgainCurve;
     LocretitransCurve locRETtransCurve;
@@ -280,6 +281,7 @@ protected:
     bool localmasktmutili;
     bool localmaskretiutili;
     bool localmaskcbutili;
+    bool localmaskblutili;
     bool lcmasexputili;
     bool lhmasexputili;
     bool llmasexputili;
diff --git a/rtengine/improcfun.h b/rtengine/improcfun.h
index 9b3a7e970..954df4b90 100644
--- a/rtengine/improcfun.h
+++ b/rtengine/improcfun.h
@@ -231,6 +231,7 @@ public:
                 LUTf & lmasktmlocalcurve, bool & localmasktmutili,
                 LUTf & lmaskretilocalcurve, bool & localmaskretiutili,
                 LUTf & lmaskcblocalcurve, bool & localmaskcbutili,
+                LUTf & lmaskbllocalcurve, bool & localmaskblutili,
                 const LocCCmaskCurve & locccmasCurve, bool & lcmasutili, const  LocLLmaskCurve & locllmasCurve, bool & llmasutili, const  LocHHmaskCurve & lochhmasCurve, bool & lhmasutili, 
                 const LocCCmaskCurve & locccmasexpCurve, bool &lcmasexputili, const  LocLLmaskCurve & locllmasexpCurve, bool &llmasexputili, const  LocHHmaskCurve & lochhmasexpCurve, bool & lhmasexputili, 
                 const LocCCmaskCurve & locccmasSHCurve, bool &lcmasSHutili, const  LocLLmaskCurve & locllmasSHCurve, bool &llmasSHutili, const  LocHHmaskCurve & lochhmasSHCurve, bool & lhmasSHutili,
diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index 6f37bdb4b..7c1dd3639 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -6718,6 +6718,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                                 LUTf & lmasktmlocalcurve, bool & localmasktmutili,
                                 LUTf & lmaskretilocalcurve, bool & localmaskretiutili,
                                 LUTf & lmaskcblocalcurve, bool & localmaskcbutili,
+                                LUTf & lmaskbllocalcurve, bool & localmaskblutili,
                                 const LocCCmaskCurve & locccmasCurve, bool & lcmasutili, const  LocLLmaskCurve & locllmasCurve, bool & llmasutili, const  LocHHmaskCurve & lochhmasCurve, bool & lhmasutili,
                                 const LocCCmaskCurve & locccmasexpCurve, bool & lcmasexputili, const  LocLLmaskCurve & locllmasexpCurve, bool & llmasexputili, const  LocHHmaskCurve & lochhmasexpCurve, bool & lhmasexputili,
                                 const LocCCmaskCurve & locccmasSHCurve, bool & lcmasSHutili, const  LocLLmaskCurve & locllmasSHCurve, bool & llmasSHutili, const  LocHHmaskCurve & lochhmasSHCurve, bool & lhmasSHutili,
@@ -6973,6 +6974,17 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
             }
 
 
+        if (lmaskbllocalcurve && localmaskblutili) {
+#ifdef _OPENMP
+            #pragma omp parallel for schedule(dynamic,16)
+#endif
+
+            for (int ir = 0; ir < GH; ir++)
+                for (int jr = 0; jr < GW; jr++) {
+                    bufmaskblurbl->L[ir][jr] = 0.5f * lmaskbllocalcurve[2.f * bufmaskblurbl->L[ir][jr]];
+                }
+        }
+
             float lap = params->locallab.spots.at(sp).lapmaskbl;
             bool pde = params->locallab.spots.at(sp).laplac;
 
diff --git a/rtengine/procevents.h b/rtengine/procevents.h
index 07d019d6b..d11376131 100644
--- a/rtengine/procevents.h
+++ b/rtengine/procevents.h
@@ -802,6 +802,7 @@ enum ProcEventCode {
     EvlocallabLmasktmshape = 772,
     EvlocallabLmaskretishape = 773,
     EvlocallabLmaskcbshape = 774,
+    EvlocallabLmaskblshape = 775,
     NUMOFEVENTS
 };
 
diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index 97408cbf9..5e4457b2f 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -2567,6 +2567,7 @@ LocallabParams::LocallabSpot::LocallabSpot() :
     gammaskbl(1.0),
     slomaskbl(0.0),
     lapmaskbl(0.0),
+    Lmaskblcurve{(double)DCT_NURBS, 0.0, 0.0, 1.0, 1.0},
     // Tone Mapping
     exptonemap(false),
     stren(0.5),
@@ -2855,6 +2856,7 @@ bool LocallabParams::LocallabSpot::operator ==(const LocallabSpot& other) const
         && gammaskbl == other.gammaskbl
         && slomaskbl == other.slomaskbl
         && lapmaskbl == other.lapmaskbl
+        && Lmaskblcurve == other.Lmaskblcurve
         // Tone Mapping
         && exptonemap == other.exptonemap
         && stren == other.stren
@@ -4129,6 +4131,7 @@ int ProcParams::save(const Glib::ustring& fname, const Glib::ustring& fname2, bo
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).gammaskbl, "Locallab", "Gammaskbl_" + std::to_string(i), spot.gammaskbl, keyFile);
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).slomaskbl, "Locallab", "Slomaskbl_" + std::to_string(i), spot.slomaskbl, keyFile);
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).lapmaskbl, "Locallab", "Lapmaskbl_" + std::to_string(i), spot.lapmaskbl, keyFile);
+                saveToKeyfile(!pedited || pedited->locallab.spots.at(i).Lmaskblcurve, "Locallab", "LmaskblCurve_" + std::to_string(i), spot.Lmaskblcurve, keyFile);
                 // Tone Mapping
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).exptonemap, "Locallab", "Exptonemap_" + std::to_string(i), spot.exptonemap, keyFile);
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).stren, "Locallab", "Stren_" + std::to_string(i), spot.stren, keyFile);
@@ -5530,6 +5533,7 @@ int ProcParams::load(const Glib::ustring& fname, ParamsEdited* pedited)
                 assignFromKeyfile(keyFile, "Locallab", "Gammaskbl_" + std::to_string(i), pedited, spot.gammaskbl, spotEdited.gammaskbl);
                 assignFromKeyfile(keyFile, "Locallab", "Slomaskbl_" + std::to_string(i), pedited, spot.slomaskbl, spotEdited.slomaskbl);
                 assignFromKeyfile(keyFile, "Locallab", "Lapmaskbl_" + std::to_string(i), pedited, spot.lapmaskbl, spotEdited.lapmaskbl);
+                assignFromKeyfile(keyFile, "Locallab", "LmaskblCurve_" + std::to_string(i), pedited, spot.Lmaskblcurve, spotEdited.Lmaskblcurve);
                 // Tone Mapping
                 assignFromKeyfile(keyFile, "Locallab", "Exptonemap_" + std::to_string(i), pedited, spot.exptonemap, spotEdited.exptonemap);
                 assignFromKeyfile(keyFile, "Locallab", "Stren_" + std::to_string(i), pedited, spot.stren, spotEdited.stren);
diff --git a/rtengine/procparams.h b/rtengine/procparams.h
index 15563ae49..973773f66 100644
--- a/rtengine/procparams.h
+++ b/rtengine/procparams.h
@@ -1116,6 +1116,7 @@ struct LocallabParams {
         double gammaskbl;
         double slomaskbl;
         double lapmaskbl;
+        std::vector<double> Lmaskblcurve;
         // Tone Mapping
         bool exptonemap;
         double stren;
diff --git a/rtengine/refreshmap.cc b/rtengine/refreshmap.cc
index ed916f7c0..dcb9bf4a3 100644
--- a/rtengine/refreshmap.cc
+++ b/rtengine/refreshmap.cc
@@ -801,7 +801,8 @@ int refreshmap[rtengine::NUMOFEVENTS] = {
     LUMINANCECURVE,          //EvlocallabLmaskSHshape
     LUMINANCECURVE,          //EvlocallabLmasktmshape
     LUMINANCECURVE,          //EvlocallabLmaskretishape
-    LUMINANCECURVE          //EvlocallabLmaskcbshape
+    LUMINANCECURVE,          //EvlocallabLmaskcbshape
+    LUMINANCECURVE          //EvlocallabLmaskblshape
 };
 
 namespace rtengine
diff --git a/rtengine/simpleprocess.cc b/rtengine/simpleprocess.cc
index 9a711a8a9..6e18cb522 100644
--- a/rtengine/simpleprocess.cc
+++ b/rtengine/simpleprocess.cc
@@ -1130,6 +1130,7 @@ private:
             LUTf lmasktmlocalcurve(65536, 0);
             LUTf lmaskretilocalcurve(65536, 0);
             LUTf lmaskcblocalcurve(65536, 0);
+            LUTf lmaskbllocalcurve(65536, 0);
 
            // int maxspot = 1;
             float** shbuffer = nullptr;
@@ -1158,6 +1159,7 @@ private:
                 bool localmasktmutili = false;
                 bool localmaskretiutili = false;
                 bool localmaskcbutili = false;
+                bool localmaskblutili = false;
                 bool lcmasexputili = false;
                 bool lhmasexputili = false;
                 bool llmasexputili = false;
@@ -1212,6 +1214,7 @@ private:
                 CurveFactory::curvemaskLocal(localmasktmutili, params.locallab.spots.at(sp).Lmasktmcurve, lmasktmlocalcurve, 1);
                 CurveFactory::curvemaskLocal(localmaskretiutili, params.locallab.spots.at(sp).Lmaskreticurve, lmaskretilocalcurve, 1);
                 CurveFactory::curvemaskLocal(localmaskcbutili, params.locallab.spots.at(sp).Lmaskcbcurve, lmaskcblocalcurve, 1);
+                CurveFactory::curvemaskLocal(localmaskblutili, params.locallab.spots.at(sp).Lmaskblcurve, lmaskbllocalcurve, 1);
                 //provisory
                 double ecomp = params.locallab.spots.at(sp).expcomp;
                 double black = params.locallab.spots.at(sp).black;
@@ -1252,6 +1255,7 @@ private:
                      lmasktmlocalcurve, localmasktmutili,
                      lmaskretilocalcurve, localmaskretiutili,
                      lmaskcblocalcurve, localmaskcbutili,
+                     lmaskbllocalcurve, localmaskblutili,
                      locccmasCurve, lcmasutili, locllmasCurve, llmasutili, lochhmasCurve, lhmasutili, locccmasexpCurve, lcmasexputili, locllmasexpCurve, llmasexputili, lochhmasexpCurve, lhmasexputili,
                      locccmasSHCurve, lcmasSHutili, locllmasSHCurve, llmasSHutili, lochhmasSHCurve, lhmasSHutili,
                      locccmascbCurve, lcmascbutili, locllmascbCurve, llmascbutili, lochhmascbCurve, lhmascbutili,
@@ -1275,6 +1279,7 @@ private:
                 lmasktmlocalcurve.clear();
                 lmaskretilocalcurve.clear();
                 lmaskcblocalcurve.clear();
+                lmaskbllocalcurve.clear();
                 shtonecurveloc.clear();
                 tonecurveloc.clear();
                 lightCurveloc.clear();
diff --git a/rtgui/locallab.cc b/rtgui/locallab.cc
index 727a8be62..487de19f4 100644
--- a/rtgui/locallab.cc
+++ b/rtgui/locallab.cc
@@ -167,6 +167,7 @@ Locallab::Locallab():
     curveEditorGG(new CurveEditorGroup(options.lastlocalCurvesDir, M("TP_VIBRANCE_CURVEEDITOR_SKINTONES_LABEL"))),
     //Blur
     maskblCurveEditorG(new CurveEditorGroup(options.lastlocalCurvesDir, M("TP_LOCALLAB_MASK"))),
+    mask2blCurveEditorG(new CurveEditorGroup(options.lastlocalCurvesDir, M("TP_LOCALLAB_MASK"))),
 
     //TM
     masktmCurveEditorG(new CurveEditorGroup(options.lastlocalCurvesDir, M("TP_LOCALLAB_MASK"))),
@@ -2123,6 +2124,24 @@ Locallab::Locallab():
     HHmaskblshape->setBottomBarColorProvider(this, 6);
 
     maskblCurveEditorG->curveListComplete();
+
+    mask2blCurveEditorG->setCurveListener(this);
+    Lmaskblshape = static_cast<DiagonalCurveEditor*>(mask2blCurveEditorG->addCurve(CT_Diagonal, "L(L)"));
+    Lmaskblshape->setResetCurve(DiagonalCurveType(defSpot.Lmaskblcurve.at(0)), defSpot.Lmaskblcurve);
+
+    if (showtooltip) {
+        Lmaskblshape->setTooltip(M("TP_LOCALLAB_CURVEEDITOR_LL_TOOLTIP"));
+    }
+
+    std::vector<GradientMilestone> mLmaskblshape;
+    mLmaskblshape.push_back(GradientMilestone(0., 0., 0., 0.));
+    mLmaskblshape.push_back(GradientMilestone(1., 1., 1., 1.));
+    Lmaskblshape->setBottomBarBgGradient(mLmaskblshape);
+    Lmaskblshape->setLeftBarBgGradient(mLmaskblshape);
+    mask2blCurveEditorG->curveListComplete();
+    
+    
+    
     enablMaskConn = enablMask->signal_toggled().connect(sigc::mem_fun(*this, &Locallab::enablMaskChanged));
 
     showmaskblMethod->append(M("TP_LOCALLAB_SHOWMNONE"));
@@ -2188,6 +2207,7 @@ Locallab::Locallab():
     maskblBox->pack_start(*chromaskbl, Gtk::PACK_SHRINK, 0);
     maskblBox->pack_start(*gammaskbl, Gtk::PACK_SHRINK, 0);
     maskblBox->pack_start(*slomaskbl, Gtk::PACK_SHRINK, 0);
+    maskblBox->pack_start(*mask2blCurveEditorG, Gtk::PACK_SHRINK, 4); // Padding is mandatory to correct behavior of curve editor
     expmaskbl->add(*maskblBox, false);
     panel->pack_start(*expmaskbl);
 
@@ -2331,6 +2351,7 @@ Locallab::~Locallab()
     delete LocalcurveEditorwav;
     delete masktmCurveEditorG;
     delete maskblCurveEditorG;
+    delete mask2blCurveEditorG;
     delete maskretiCurveEditorG;
     delete mask2retiCurveEditorG;
     delete maskcbCurveEditorG;
@@ -3393,6 +3414,7 @@ void Locallab::write(ProcParams* pp, ParamsEdited* pedited)
                     pp->locallab.spots.at(pp->locallab.selspot).slomaskbl = slomaskbl->getValue();
                     pp->locallab.spots.at(pp->locallab.selspot).lapmaskbl = lapmaskbl->getValue();
                     pp->locallab.spots.at(pp->locallab.selspot).fftwbl = fftwbl->get_active();
+                    pp->locallab.spots.at(pp->locallab.selspot).Lmaskblcurve = Lmaskblshape->getCurve();
 
                     // Tone Mapping
                     pp->locallab.spots.at(pp->locallab.selspot).exptonemap = exptonemap->getEnabled();
@@ -3698,6 +3720,7 @@ void Locallab::write(ProcParams* pp, ParamsEdited* pedited)
                         pe->locallab.spots.at(pp->locallab.selspot).slomaskbl = pe->locallab.spots.at(pp->locallab.selspot).slomaskbl || slomaskbl->getEditedState();
                         pe->locallab.spots.at(pp->locallab.selspot).lapmaskbl = pe->locallab.spots.at(pp->locallab.selspot).lapmaskbl || lapmaskbl->getEditedState();
                         pe->locallab.spots.at(pp->locallab.selspot).fftwbl = pe->locallab.spots.at(pp->locallab.selspot).fftwbl || !fftwbl->get_inconsistent();
+                        pe->locallab.spots.at(pp->locallab.selspot).Lmaskblcurve = pe->locallab.spots.at(pp->locallab.selspot).Lmaskblcurve || !Lmaskblshape->isUnChanged();
                         // Tone Mapping
                         pe->locallab.spots.at(pp->locallab.selspot).exptonemap = pe->locallab.spots.at(pp->locallab.selspot).activlum || !exptonemap->get_inconsistent();
                         pe->locallab.spots.at(pp->locallab.selspot).stren = pe->locallab.spots.at(pp->locallab.selspot).stren || stren->getEditedState();
@@ -3990,6 +4013,7 @@ void Locallab::write(ProcParams* pp, ParamsEdited* pedited)
                         pedited->locallab.spots.at(pp->locallab.selspot).slomaskbl = pedited->locallab.spots.at(pp->locallab.selspot).slomaskbl || slomaskbl->getEditedState();
                         pedited->locallab.spots.at(pp->locallab.selspot).lapmaskbl = pedited->locallab.spots.at(pp->locallab.selspot).lapmaskbl || lapmaskbl->getEditedState();
                         pedited->locallab.spots.at(pp->locallab.selspot).fftwbl = pedited->locallab.spots.at(pp->locallab.selspot).fftwbl || !fftwbl->get_inconsistent();
+                        pedited->locallab.spots.at(pp->locallab.selspot).Lmaskblcurve = pedited->locallab.spots.at(pp->locallab.selspot).Lmaskblcurve || !Lmaskblshape->isUnChanged();
                         // Tone Mapping
                         pedited->locallab.spots.at(pp->locallab.selspot).exptonemap = pedited->locallab.spots.at(pp->locallab.selspot).exptonemap || !exptonemap->get_inconsistent();
                         pedited->locallab.spots.at(pp->locallab.selspot).stren = pedited->locallab.spots.at(pp->locallab.selspot).stren || stren->getEditedState();
@@ -4395,6 +4419,12 @@ void Locallab::curveChanged(CurveEditor* ce)
             }
         }
 
+        if (ce == Lmaskblshape) {
+            if (listener) {
+                listener->panelChanged(EvlocallabLmaskblshape, M("HISTORY_CUSTOMCURVE"));
+            }
+        }
+
     }
 
     // TM
@@ -8154,6 +8184,7 @@ void Locallab::updateLocallabGUI(const rtengine::procparams::ProcParams* pp, con
         slomaskbl->setValue(pp->locallab.spots.at(index).slomaskbl);
         lapmaskbl->setValue(pp->locallab.spots.at(index).lapmaskbl);
         fftwbl->set_active(pp->locallab.spots.at(index).fftwbl);
+        Lmaskblshape->setCurve(pp->locallab.spots.at(index).Lmaskblcurve);
 
         // Tone Mapping
         exptonemap->setEnabled(pp->locallab.spots.at(index).exptonemap);
@@ -8504,6 +8535,7 @@ void Locallab::updateLocallabGUI(const rtengine::procparams::ProcParams* pp, con
                 slomaskbl->setEditedState(spotState->slomaskbl ? Edited : UnEdited);
                 lapmaskbl->setEditedState(spotState->lapmaskbl ? Edited : UnEdited);
                 fftwbl->set_inconsistent(multiImage && !spotState->fftwbl);
+                Lmaskblshape->setUnChanged(!spotState->Lmaskblcurve);
 
                 // Tone Mapping
                 exptonemap->set_inconsistent(!spotState->exptonemap);
diff --git a/rtgui/locallab.h b/rtgui/locallab.h
index 69321f959..856a8de20 100644
--- a/rtgui/locallab.h
+++ b/rtgui/locallab.h
@@ -104,6 +104,8 @@ private:
     DiagonalCurveEditor* skinTonesCurve;
     //Blur and noise
     CurveEditorGroup* const maskblCurveEditorG;
+    CurveEditorGroup* const mask2blCurveEditorG;
+    DiagonalCurveEditor* Lmaskblshape;
     FlatCurveEditor* CCmaskblshape;
     FlatCurveEditor* LLmaskblshape;
     FlatCurveEditor* HHmaskblshape;
diff --git a/rtgui/paramsedited.cc b/rtgui/paramsedited.cc
index 3f28a2b55..d6f8d737a 100644
--- a/rtgui/paramsedited.cc
+++ b/rtgui/paramsedited.cc
@@ -1107,6 +1107,7 @@ void ParamsEdited::initFrom(const std::vector<rtengine::procparams::ProcParams>&
                 locallab.spots.at(j).slomaskbl = locallab.spots.at(j).slomaskbl && pSpot.slomaskbl == otherSpot.slomaskbl;
                 locallab.spots.at(j).lapmaskbl = locallab.spots.at(j).lapmaskbl && pSpot.lapmaskbl == otherSpot.lapmaskbl;
                 locallab.spots.at(j).fftwbl = locallab.spots.at(j).fftwbl && pSpot.fftwbl == otherSpot.fftwbl;
+                locallab.spots.at(j).Lmaskblcurve = locallab.spots.at(j).Lmaskblcurve && pSpot.Lmaskblcurve == otherSpot.Lmaskblcurve;
                 // Tone Mapping
                 locallab.spots.at(j).exptonemap = locallab.spots.at(j).exptonemap && pSpot.exptonemap == otherSpot.exptonemap;
                 locallab.spots.at(j).stren = locallab.spots.at(j).stren && pSpot.stren == otherSpot.stren;
@@ -3307,6 +3308,10 @@ void ParamsEdited::combine(rtengine::procparams::ProcParams& toEdit, const rteng
             toEdit.locallab.spots.at(i).lapmaskbl = mods.locallab.spots.at(i).lapmaskbl;
         }
 
+        if (locallab.spots.at(i).Lmaskblcurve) {
+            toEdit.locallab.spots.at(i).Lmaskblcurve = mods.locallab.spots.at(i).Lmaskblcurve;
+        }
+
         // Tone Mapping
         if (locallab.spots.at(i).exptonemap) {
             toEdit.locallab.spots.at(i).exptonemap = mods.locallab.spots.at(i).exptonemap;
@@ -4905,6 +4910,7 @@ LocallabParamsEdited::LocallabSpotEdited::LocallabSpotEdited(bool v) :
     gammaskbl(v),
     slomaskbl(v),
     lapmaskbl(v),
+    Lmaskblcurve(v),
     // Tone Mapping
     exptonemap(v),
     stren(v),
@@ -5190,6 +5196,7 @@ void LocallabParamsEdited::LocallabSpotEdited::set(bool v)
     gammaskbl = v;
     slomaskbl = v;
     lapmaskbl = v;
+    Lmaskblcurve = v;
     // Tone Mapping
     exptonemap = v;
     stren = v;
diff --git a/rtgui/paramsedited.h b/rtgui/paramsedited.h
index 2c6a70fe0..c849da583 100644
--- a/rtgui/paramsedited.h
+++ b/rtgui/paramsedited.h
@@ -526,6 +526,7 @@ public:
         bool gammaskbl;
         bool slomaskbl;
         bool lapmaskbl;
+        bool Lmaskblcurve;
         // Tone Mapping
         bool exptonemap;
         bool stren;