diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index c6043010b..c62c0e23f 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -9897,7 +9897,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
 
 
 #ifdef _OPENMP
-                //        #pragma omp parallel for schedule(dynamic,16)
+                #pragma omp parallel for schedule(dynamic,16)
 #endif
 
                 for (int y = 0; y < transformed->H ; y++) //{
@@ -9995,7 +9995,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                     if (lp.showmaskexpmet != 3 || lp.enaExpMask) {
 
 #ifdef _OPENMP
-//                       #pragma omp parallel for schedule(dynamic,16)
+                        #pragma omp parallel for schedule(dynamic,16)
 #endif
 
                         for (int y = 0; y < transformed->H ; y++) //{
@@ -10015,9 +10015,9 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
 
                                 if (lox >= begx && lox < xEn && loy >= begy && loy < yEn) {
                                     if (zone > 0) {
-                                        bufexporig->L[loy - begy][lox - begx] = bufexporig->L[loy - begy][lox - begx] + (lp.blendmaexp * bufmaskorigexp->L[loy - begy][lox - begx]);
-                                        bufexporig->a[loy - begy][lox - begx] = bufexporig->a[loy - begy][lox - begx] * (1.f + lp.blendmaexp * bufmaskorigexp->a[loy - begy][lox - begx]);
-                                        bufexporig->b[loy - begy][lox - begx] = bufexporig->b[loy - begy][lox - begx] * (1.f + lp.blendmaexp * bufmaskorigexp->b[loy - begy][lox - begx]);
+                                        bufexporig->L[loy - begy][lox - begx] += (lp.blendmaexp * bufmaskorigexp->L[loy - begy][lox - begx]);
+                                        bufexporig->a[loy - begy][lox - begx] *= (1.f + lp.blendmaexp * bufmaskorigexp->a[loy - begy][lox - begx]);
+                                        bufexporig->b[loy - begy][lox - begx] *= (1.f + lp.blendmaexp * bufmaskorigexp->b[loy - begy][lox - begx]);
 
                                         bufexporig->L[loy - begy][lox - begx] = CLIP(bufexporig->L[loy - begy][lox - begx]);
                                         bufexporig->a[loy - begy][lox - begx] = CLIPC(bufexporig->a[loy - begy][lox - begx]);
@@ -10026,7 +10026,31 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                                         originalmaskexp->L[y][x] = CLIP(bufexporig->L[loy - begy][lox - begx] -  bufmaskorigexp->L[loy - begy][lox - begx]);
                                         originalmaskexp->a[y][x] = CLIPC(bufexporig->a[loy - begy][lox - begx] * (1.f - bufmaskorigexp->a[loy - begy][lox - begx]));
                                         originalmaskexp->b[y][x] = CLIPC(bufexporig->b[loy - begy][lox - begx] * (1.f - bufmaskorigexp->b[loy - begy][lox - begx]));
+
+                                        switch (zone) {
+
+                                            case 1: {
+                                                original->L[y][x] += (lp.blendmaexp * localFactor * bufmaskorigexp->L[loy - begy][lox - begx]);
+                                                original->a[y][x] *= (1.f + lp.blendmaexp * localFactor * bufmaskorigexp->a[loy - begy][lox - begx]);
+                                                original->b[y][x] *= (1.f + lp.blendmaexp * localFactor * bufmaskorigexp->b[loy - begy][lox - begx]);
+                                                original->L[y][x] = CLIP(original->L[y][x]);
+                                                original->a[y][x] = CLIPC(original->a[y][x]);
+                                                original->b[y][x] = CLIPC(original->b[y][x]);
+                                                break;
+                                            }
+
+                                            case 2: {
+
+                                                original->L[y][x] = bufexporig->L[loy - begy][lox - begx];
+                                                original->a[y][x] = bufexporig->a[loy - begy][lox - begx];
+                                                original->b[y][x] = bufexporig->b[loy - begy][lox - begx];
+
+                                            }
+
+                                        }
                                     }
+
+
                                 }
                             }
 
@@ -10061,7 +10085,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                             }
 
                         delete bufmaskorigexp;
-						delete bufexporig;
+                        delete bufexporig;
 
                         return;
                     }
@@ -10399,7 +10423,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                 }
 
 #ifdef _OPENMP
-                //              #pragma omp parallel for schedule(dynamic,16)
+                #pragma omp parallel for schedule(dynamic,16)
 #endif
 
                 for (int y = 0; y < transformed->H ; y++) //{
@@ -10491,7 +10515,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                     if (lp.showmaskcolmet != 3 || lp.enaColorMask) {
 
 #ifdef _OPENMP
-//                    #pragma omp parallel for schedule(dynamic,16)
+                        #pragma omp parallel for schedule(dynamic,16)
 #endif
 
                         for (int y = 0; y < transformed->H ; y++) //{
@@ -10512,9 +10536,9 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                                 if (lox >= begx && lox < xEn && loy >= begy && loy < yEn) {
                                     if (zone > 0) {
 
-                                        bufcolorig->L[loy - begy][lox - begx] = bufcolorig->L[loy - begy][lox - begx] + (lp.blendmacol * bufmaskorigcol->L[loy - begy][lox - begx]);
-                                        bufcolorig->a[loy - begy][lox - begx] = bufcolorig->a[loy - begy][lox - begx] * (1.f + lp.blendmacol * bufmaskorigcol->a[loy - begy][lox - begx]);
-                                        bufcolorig->b[loy - begy][lox - begx] = bufcolorig->b[loy - begy][lox - begx] * (1.f + lp.blendmacol * bufmaskorigcol->b[loy - begy][lox - begx]);
+                                        bufcolorig->L[loy - begy][lox - begx] += (lp.blendmacol * bufmaskorigcol->L[loy - begy][lox - begx]);
+                                        bufcolorig->a[loy - begy][lox - begx] *= (1.f + lp.blendmacol * bufmaskorigcol->a[loy - begy][lox - begx]);
+                                        bufcolorig->b[loy - begy][lox - begx] *= (1.f + lp.blendmacol * bufmaskorigcol->b[loy - begy][lox - begx]);
 
                                         bufcolorig->L[loy - begy][lox - begx] = CLIP(bufcolorig->L[loy - begy][lox - begx]);
                                         bufcolorig->a[loy - begy][lox - begx] = CLIPC(bufcolorig->a[loy - begy][lox - begx]);
@@ -10524,8 +10548,29 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                                         originalmaskcol->a[y][x] = CLIPC(bufcolorig->a[loy - begy][lox - begx] * (1.f - bufmaskorigcol->a[loy - begy][lox - begx]));
                                         originalmaskcol->b[y][x] = CLIPC(bufcolorig->b[loy - begy][lox - begx] * (1.f - bufmaskorigcol->b[loy - begy][lox - begx]));
 
-                                    }
+                                        switch (zone) {
 
+                                            case 1: {
+                                                original->L[y][x] += (lp.blendmacol * localFactor * bufmaskorigcol->L[loy - begy][lox - begx]);
+                                                original->a[y][x] *= (1.f + lp.blendmacol * localFactor * bufmaskorigcol->a[loy - begy][lox - begx]);
+                                                original->b[y][x] *= (1.f + lp.blendmacol * localFactor * bufmaskorigcol->b[loy - begy][lox - begx]);
+                                                original->L[y][x] = CLIP(original->L[y][x]);
+                                                original->a[y][x] = CLIPC(original->a[y][x]);
+                                                original->b[y][x] = CLIPC(original->b[y][x]);
+                                                break;
+                                            }
+
+                                            case 2: {
+
+                                                original->L[y][x] = bufcolorig->L[loy - begy][lox - begx];
+                                                original->a[y][x] = bufcolorig->a[loy - begy][lox - begx];
+                                                original->b[y][x] = bufcolorig->b[loy - begy][lox - begx];
+
+                                            }
+
+                                        }
+
+                                    }
                                 }
                             }
 
@@ -10560,7 +10605,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                             }
 
                         delete bufmaskorigcol;
-						delete bufcolorig;
+                        delete bufcolorig;
                         return;
 
                     }
diff --git a/rtgui/locallab.cc b/rtgui/locallab.cc
index b30ac9f9c..330f66a7c 100644
--- a/rtgui/locallab.cc
+++ b/rtgui/locallab.cc
@@ -77,7 +77,7 @@ Locallab::Locallab():
     chroma(Gtk::manage(new Adjuster(M("TP_LOCALLAB_CHROMA"), -100, 150, 1, 0))),
     sensi(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SENSI"), 0, 100, 1, 19))),
     structcol(Gtk::manage(new Adjuster(M("TP_LOCALLAB_STRUCCOL"), 0, 100, 1, 0))),
-    blendmaskcol(Gtk::manage(new Adjuster(M("TP_LOCALLAB_BLENDMASKCOL"), -100, 150, 1, 0))),
+    blendmaskcol(Gtk::manage(new Adjuster(M("TP_LOCALLAB_BLENDMASKCOL"), -100, 100, 1, 0))),
     // Exposure
     expcomp(Gtk::manage(new Adjuster(M("TP_EXPOSURE_EXPCOMP"), -200, 400, 5, 0))),
     hlcompr(Gtk::manage(new Adjuster(M("TP_EXPOSURE_COMPRHIGHLIGHTS"), 0, 500, 1, 60))),
@@ -88,7 +88,7 @@ Locallab::Locallab():
     sensiex(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SENSI"), 0, 100, 1, 15))),
     structexp(Gtk::manage(new Adjuster(M("TP_LOCALLAB_STRUCCOL"), 0, 100, 1, 0))),
     blurexpde(Gtk::manage(new Adjuster(M("TP_LOCALLAB_BLURDE"), 2, 100, 1, 5))),   
-    blendmaskexp(Gtk::manage(new Adjuster(M("TP_LOCALLAB_BLENDMASKCOL"), -100, 150, 1, 0))),
+    blendmaskexp(Gtk::manage(new Adjuster(M("TP_LOCALLAB_BLENDMASKCOL"), -100, 100, 1, 0))),
     // Vibrance
     saturated(Gtk::manage(new Adjuster(M("TP_VIBRANCE_SATURATED"), -100., 100., 1., 0.))),
     pastels(Gtk::manage(new Adjuster(M("TP_VIBRANCE_PASTELS"), -100., 100., 1., 0.))),