diff --git a/rtdata/languages/default b/rtdata/languages/default
index f80329eaa..ce3ff23f3 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -993,6 +993,7 @@ HISTORY_MSG_752;Local - Reti Offset
 HISTORY_MSG_753;Local - Reti Transmission map
 HISTORY_MSG_754;Local - Reti Clip
 HISTORY_MSG_755;Local - TM use tm mask
+HISTORY_MSG_756;Local - Exp use algo exposure mask
 HISTORY_MSG_CLAMPOOG;Clip out-of-gamut colors
 HISTORY_MSG_COLORTONING_LABGRID_VALUE;CT - Color correction
 HISTORY_MSG_COLORTONING_LABREGION_AB;CT - Color correction
@@ -2146,6 +2147,7 @@ TP_LOCALLAB_EXCLUTYPE_TOOLTIP;Normal spot use recursive data.\nExcluding spot re
 TP_LOCALLAB_EXNORM;Normal spot
 TP_LOCALLAB_EXECLU;Excluding spot
 TP_LOCALLAB_EXPOSE;Exposure
+TP_LOCALLAB_ENABLE_MASKAFT;Use all algorithms Exposure
 TP_LOCALLAB_EXPOSURE_TOOLTIP;In some cases (strong shadows ..) you can use the module "Shadows Highlights"
 TP_LOCALLAB_EXPCHROMA;Chroma compensation
 TP_LOCALLAB_GUIDFILTER;Guided filter radius
diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index 726350748..442471907 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -2579,7 +2579,7 @@ void maskcalccol(int bfw, int bfh, int xstart, int ystart, int sk, int cx, int c
         }
 
         if (zero || modif || modmask || deltaE || enaMask) {
-            originalmaskcol->CopyFrom(transformed);
+            originalmaskcol->CopyFrom(bufcolorig);
             blendmask(lp, xstart, ystart, cx, cy, bfw, bfh, bufcolorig, original, bufmaskblurcol, originalmaskcol, blendm, inv);
         }
     }
@@ -7573,6 +7573,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
 
                                 return;
                             }
+
                             original->CopyFrom(orimask);
                         }
 
@@ -9773,8 +9774,12 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
 
                 std::unique_ptr<LabImage> bufexporig(new LabImage(bfw, bfh));
                 std::unique_ptr<LabImage> bufexpfin(new LabImage(bfw, bfh));
+                std::unique_ptr<LabImage> bufexporigmas(new LabImage(bfw, bfh));
+                std::unique_ptr<LabImage> bufexpfinmas(new LabImage(bfw, bfh));
                 std::unique_ptr<LabImage> bufmaskblurexp;
                 std::unique_ptr<LabImage> originalmaskexp;
+                LabImage *orimask = nullptr;
+                orimask = new LabImage(original->W, original->H);
 
 
                 array2D<float> buflight(bfw, bfh);
@@ -9786,9 +9791,10 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                 if (call <= 3) { //simpleprocess, dcrop, improccoordinator
                     float meansob = 0.f;
 
-                    if (lp.showmaskexpmet == 2  || lp.enaExpMask || lp.showmaskexpmet == 3 || lp.showmaskexpmet == 5) {
+                    if (lp.showmaskexpmet == 0 || lp.showmaskexpmet == 2  || lp.enaExpMask || lp.showmaskexpmet == 3 || lp.showmaskexpmet == 5) {
                         bufmaskblurexp.reset(new LabImage(bfw, bfh));
                         originalmaskexp.reset(new LabImage(bfw, bfh));
+                        orimask->CopyFrom(original);
                     }
 
 #ifdef _OPENMP
@@ -9798,6 +9804,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                     for (int y = ystart; y < yend; y++) {
                         for (int x = xstart; x < xend; x++) {
                             bufexporig->L[y - ystart][x - xstart] = original->L[y][x];
+                            bufexporigmas->L[y - ystart][x - xstart] = original->L[y][x];
                         }
                     }
 
@@ -9884,21 +9891,25 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                     float gamma = lp.gammaexp;
                     float slope = lp.slomaexp;
                     float blendm = lp.blendmaexp;
-                    maskcalccol(bfw, bfh, xstart, ystart, sk, cx, cy, bufexporig.get(), bufmaskblurexp.get(), originalmaskexp.get(), original, transformed, inv, lp,
-                                locccmasexpCurve, lcmasexputili, locllmasexpCurve, llmasexputili, lochhmasexpCurve, lhmasexputili, multiThread,
-                                enaMask, showmaske, deltaE, modmask, zero, modif, chrom, rad, gamma, slope, blendm);
 
-                    if (lp.showmaskexpmet == 3) {
-                        showmask(lp, xstart, ystart, cx, cy, bfw, bfh, bufexporig.get(), transformed, bufmaskblurexp.get(), 0);
+                    if (!params->locallab.spots.at(sp).enaExpMaskaft) {
 
-                        return;
+                        maskcalccol(bfw, bfh, xstart, ystart, sk, cx, cy, bufexporigmas.get(), bufmaskblurexp.get(), originalmaskexp.get(), original, transformed, inv, lp,
+                                    locccmasexpCurve, lcmasexputili, locllmasexpCurve, llmasexputili, lochhmasexpCurve, lhmasexputili, multiThread,
+                                    enaMask, showmaske, deltaE, modmask, zero, modif, chrom, rad, gamma, slope, blendm);
+
+                        if (lp.showmaskexpmet == 3) {
+                            showmask(lp, xstart, ystart, cx, cy, bfw, bfh, bufexporig.get(), transformed, bufmaskblurexp.get(), 0);
+
+                            return;
+                        }
                     }
 
                     if (lp.showmaskexpmet == 4) {
                         return;
                     }
 
-                    if (lp.showmaskexpmet == 0 || lp.showmaskexpmet == 1  || lp.showmaskexpmet == 2  || lp.showmaskexpmet == 5 || lp.enaExpMask) {
+                    if (lp.showmaskexpmet == 0 || lp.showmaskexpmet == 3 || lp.showmaskexpmet == 1  || lp.showmaskexpmet == 2  || lp.showmaskexpmet == 5 || lp.enaExpMask) {
 #ifdef _OPENMP
                         #pragma omp parallel for schedule(dynamic,16)
 #endif
@@ -10046,6 +10057,25 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                         }
 
 
+                        bufexpfinmas->CopyFrom(bufexpfin.get());
+
+                        if (params->locallab.spots.at(sp).enaExpMaskaft) {
+                            blendm = -lp.blendmaexp;
+
+                            maskcalccol(bfw, bfh, xstart, ystart, sk, cx, cy, bufexpfinmas.get(), bufmaskblurexp.get(), originalmaskexp.get(), orimask, transformed, inv, lp,
+                                        locccmasexpCurve, lcmasexputili, locllmasexpCurve, llmasexputili, lochhmasexpCurve, lhmasexputili, multiThread,
+                                        enaMask, showmaske, deltaE, modmask, zero, modif, chrom, rad, gamma, slope, blendm);
+
+                            if (lp.showmaskexpmet == 3) {
+                                showmask(lp, xstart, ystart, cx, cy, bfw, bfh, bufexpfinmas.get(), transformed, bufmaskblurexp.get(), 0);
+
+                                return;
+                            }
+                        }
+
+                        delete orimask;
+
+
                         constexpr float ampli = 70.f;
                         const float ch = (1.f + 0.02f * lp.expchroma);
                         const float chprosl = ch <= 1.f ? 99.f * ch - 99.f : CLIPCHRO(ampli * ch - ampli);
diff --git a/rtengine/procevents.h b/rtengine/procevents.h
index 8463001a3..3847e7949 100644
--- a/rtengine/procevents.h
+++ b/rtengine/procevents.h
@@ -782,6 +782,7 @@ enum ProcEventCode {
     EvlocallabCTtransCurve = 752,
     Evlocallabcliptm = 753,
     EvLocallabEnatmMaskaft = 754,
+    EvLocallabEnaExpMaskaft = 755,
     NUMOFEVENTS
 };
 
diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index 57925349c..c529034e5 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -2479,6 +2479,7 @@ LocallabParams::LocallabSpot::LocallabSpot() :
     excurve{(double)DCT_NURBS, 0.0, 0.0, 1.0, 1.0},
     inversex(false),
     enaExpMask(false),
+    enaExpMaskaft(false),
     CCmaskexpcurve{(double)FCT_MinMaxCPoints,0.0, 1.0, 0.35, 0.35, 0.50, 1.0, 0.35, 0.35, 1.0, 1.0, 0.35, 0.35 },
     LLmaskexpcurve{(double)FCT_MinMaxCPoints, 0.0, 1.0, 0.35, 0.35, 0.50, 1.0, 0.35, 0.35, 1.0, 1.0, 0.35, 0.35},
     HHmaskexpcurve{(double)FCT_MinMaxCPoints, 0.0, 1.0, 0.35, 0.35, 0.50, 1.0, 0.35, 0.35, 1.0, 1.0, 0.35, 0.35},
@@ -2598,7 +2599,7 @@ LocallabParams::LocallabSpot::LocallabSpot() :
     LLmaskreticurve{(double)FCT_MinMaxCPoints, 0.0, 1.0, 0.35, 0.35, 0.50, 1.0, 0.35, 0.35, 1.0, 1.0, 0.35, 0.35},
     HHmaskreticurve{(double)FCT_MinMaxCPoints, 0.0, 1.0, 0.35, 0.35, 0.50, 1.0, 0.35, 0.35, 1.0, 1.0, 0.35, 0.35},
     enaretiMask(false),
-    enaretiMasktmap(false),
+    enaretiMasktmap(true),
     blendmaskreti(0),
     radmaskreti(10.0),
     chromaskreti(0.0),
@@ -2747,6 +2748,7 @@ bool LocallabParams::LocallabSpot::operator ==(const LocallabSpot& other) const
         && excurve == other.excurve
         && inversex == other.inversex
         && enaExpMask == other.enaExpMask
+        && enaExpMaskaft == other.enaExpMaskaft
         && CCmaskexpcurve == other.CCmaskexpcurve
         && LLmaskexpcurve == other.LLmaskexpcurve
         && HHmaskexpcurve == other.HHmaskexpcurve
@@ -4001,6 +4003,7 @@ int ProcParams::save(const Glib::ustring& fname, const Glib::ustring& fname2, bo
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).excurve, "Locallab", "ExCurve_" + std::to_string(i), spot.excurve, keyFile);
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).inversex, "Locallab", "Inversex_" + std::to_string(i), spot.inversex, keyFile);
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).enaExpMask, "Locallab", "EnaExpMask_" + std::to_string(i), spot.enaExpMask, keyFile);
+                saveToKeyfile(!pedited || pedited->locallab.spots.at(i).enaExpMaskaft, "Locallab", "EnaExpMaskaft_" + std::to_string(i), spot.enaExpMaskaft, keyFile);
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).CCmaskexpcurve, "Locallab", "CCmaskexpCurve_" + std::to_string(i), spot.CCmaskexpcurve, keyFile);
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).LLmaskexpcurve, "Locallab", "LLmaskexpCurve_" + std::to_string(i), spot.LLmaskexpcurve, keyFile);
                 saveToKeyfile(!pedited || pedited->locallab.spots.at(i).HHmaskexpcurve, "Locallab", "HHmaskexpCurve_" + std::to_string(i), spot.HHmaskexpcurve, keyFile);
@@ -5370,6 +5373,7 @@ int ProcParams::load(const Glib::ustring& fname, ParamsEdited* pedited)
                 assignFromKeyfile(keyFile, "Locallab", "ExCurve_" + std::to_string(i), pedited, spot.excurve, spotEdited.excurve);
                 assignFromKeyfile(keyFile, "Locallab", "Inversex_" + std::to_string(i), pedited, spot.inversex, spotEdited.inversex);
                 assignFromKeyfile(keyFile, "Locallab", "EnaExpMask_" + std::to_string(i), pedited, spot.enaExpMask, spotEdited.enaExpMask);
+                assignFromKeyfile(keyFile, "Locallab", "EnaExpMaskaft_" + std::to_string(i), pedited, spot.enaExpMaskaft, spotEdited.enaExpMaskaft);
                 assignFromKeyfile(keyFile, "Locallab", "CCmaskexpCurve_" + std::to_string(i), pedited, spot.CCmaskexpcurve, spotEdited.CCmaskexpcurve);
                 assignFromKeyfile(keyFile, "Locallab", "LLmaskexpCurve_" + std::to_string(i), pedited, spot.LLmaskexpcurve, spotEdited.LLmaskexpcurve);
                 assignFromKeyfile(keyFile, "Locallab", "HHmaskexpCurve_" + std::to_string(i), pedited, spot.HHmaskexpcurve, spotEdited.HHmaskexpcurve);
diff --git a/rtengine/procparams.h b/rtengine/procparams.h
index f6fe06ee0..9771be5a2 100644
--- a/rtengine/procparams.h
+++ b/rtengine/procparams.h
@@ -1028,6 +1028,7 @@ struct LocallabParams {
         std::vector<double> excurve;
         bool inversex;
         bool enaExpMask;
+        bool enaExpMaskaft;
         std::vector<double> CCmaskexpcurve;
         std::vector<double> LLmaskexpcurve;
         std::vector<double> HHmaskexpcurve;
diff --git a/rtengine/refreshmap.cc b/rtengine/refreshmap.cc
index 4d14b078d..513095fee 100644
--- a/rtengine/refreshmap.cc
+++ b/rtengine/refreshmap.cc
@@ -781,7 +781,8 @@ int refreshmap[rtengine::NUMOFEVENTS] = {
     LUMINANCECURVE,          // Evlocallaboffs
     LUMINANCECURVE,          //EvlocallabCTtransCurve
     LUMINANCECURVE,          //Evlocallabcliptm
-    LUMINANCECURVE          //Evlocallabenatmmaskaft
+    LUMINANCECURVE,          //Evlocallabenatmmaskaft
+    LUMINANCECURVE          //EvlocallabenaExpmaskaft
 };
 
 
diff --git a/rtgui/locallab.cc b/rtgui/locallab.cc
index 8b7f8ed31..b8c35924e 100644
--- a/rtgui/locallab.cc
+++ b/rtgui/locallab.cc
@@ -339,6 +339,7 @@ Locallab::Locallab():
     enaColorMask(Gtk::manage(new Gtk::CheckButton(M("TP_LOCALLAB_ENABLE_MASK")))),
     // Exposure
     enaExpMask(Gtk::manage(new Gtk::CheckButton(M("TP_LOCALLAB_ENABLE_MASK")))),
+    enaExpMaskaft(Gtk::manage(new Gtk::CheckButton(M("TP_LOCALLAB_ENABLE_MASKAFT")))),
     inversex(Gtk::manage(new Gtk::CheckButton(M("TP_LOCALLAB_INVERS")))),
     //Shadows Highlight
     enaSHMask(Gtk::manage(new Gtk::CheckButton(M("TP_LOCALLAB_ENABLE_MASK")))),
@@ -793,6 +794,7 @@ Locallab::Locallab():
     curveEditorG->curveListComplete();
 
     enaExpMaskConn = enaExpMask->signal_toggled().connect(sigc::mem_fun(*this, &Locallab::enaExpMaskChanged));
+    enaExpMaskaftConn = enaExpMaskaft->signal_toggled().connect(sigc::mem_fun(*this, &Locallab::enaExpMaskaftChanged));
 
     showmaskexpMethod->append(M("TP_LOCALLAB_SHOWMNONE"));
     showmaskexpMethod->append(M("TP_LOCALLAB_SHOWMODIF"));
@@ -906,6 +908,7 @@ Locallab::Locallab():
     maskexpBox->pack_start(*showmaskexpMethod, Gtk::PACK_SHRINK, 4);
     maskexpBox->pack_start(*showmaskexpMethodinv, Gtk::PACK_SHRINK, 4);
     maskexpBox->pack_start(*enaExpMask, Gtk::PACK_SHRINK, 0);
+//    maskexpBox->pack_start(*enaExpMaskaft, Gtk::PACK_SHRINK, 0);
     maskexpBox->pack_start(*maskexpCurveEditorG, Gtk::PACK_SHRINK, 4); // Padding is mandatory to correct behavior of curve editor
     maskexpBox->pack_start(*blendmaskexp, Gtk::PACK_SHRINK, 0);
     maskexpBox->pack_start(*radmaskexp, Gtk::PACK_SHRINK, 0);
@@ -1271,7 +1274,7 @@ Locallab::Locallab():
     ToolParamBlock* const masktmBox = Gtk::manage(new ToolParamBlock());
     masktmBox->pack_start(*showmasktmMethod, Gtk::PACK_SHRINK, 4);
     masktmBox->pack_start(*enatmMask, Gtk::PACK_SHRINK, 0);
-    masktmBox->pack_start(*enatmMaskaft, Gtk::PACK_SHRINK, 0);
+//    masktmBox->pack_start(*enatmMaskaft, Gtk::PACK_SHRINK, 0);
     masktmBox->pack_start(*masktmCurveEditorG, Gtk::PACK_SHRINK, 4); // Padding is mandatory to correct behavior of curve editor
     masktmBox->pack_start(*blendmasktm, Gtk::PACK_SHRINK, 0);
     masktmBox->pack_start(*radmasktm, Gtk::PACK_SHRINK, 0);
@@ -3019,6 +3022,7 @@ void Locallab::write(ProcParams* pp, ParamsEdited* pedited)
                     pp->locallab.spots.at(pp->locallab.selspot).excurve = shapeexpos->getCurve();
                     pp->locallab.spots.at(pp->locallab.selspot).inversex = inversex->get_active();
                     pp->locallab.spots.at(pp->locallab.selspot).enaExpMask = enaExpMask->get_active();
+                    pp->locallab.spots.at(pp->locallab.selspot).enaExpMaskaft = enaExpMaskaft->get_active();
                     pp->locallab.spots.at(pp->locallab.selspot).LLmaskexpcurve = LLmaskexpshape->getCurve();
                     pp->locallab.spots.at(pp->locallab.selspot).CCmaskexpcurve = CCmaskexpshape->getCurve();
                     pp->locallab.spots.at(pp->locallab.selspot).HHmaskexpcurve = HHmaskexpshape->getCurve();
@@ -3356,6 +3360,7 @@ void Locallab::write(ProcParams* pp, ParamsEdited* pedited)
                         pe->locallab.spots.at(pp->locallab.selspot).excurve = pe->locallab.spots.at(pp->locallab.selspot).excurve || !shapeexpos->isUnChanged();
                         pe->locallab.spots.at(pp->locallab.selspot).inversex = pe->locallab.spots.at(pp->locallab.selspot).inversex || !inversex->get_inconsistent();
                         pe->locallab.spots.at(pp->locallab.selspot).enaExpMask = pe->locallab.spots.at(pp->locallab.selspot).enaExpMask || !enaExpMask->get_inconsistent();
+                        pe->locallab.spots.at(pp->locallab.selspot).enaExpMaskaft = pe->locallab.spots.at(pp->locallab.selspot).enaExpMaskaft || !enaExpMaskaft->get_inconsistent();
                         pe->locallab.spots.at(pp->locallab.selspot).CCmaskexpcurve = pe->locallab.spots.at(pp->locallab.selspot).CCmaskexpcurve || !CCmaskexpshape->isUnChanged();
                         pe->locallab.spots.at(pp->locallab.selspot).LLmaskexpcurve = pe->locallab.spots.at(pp->locallab.selspot).LLmaskexpcurve || !LLmaskexpshape->isUnChanged();
                         pe->locallab.spots.at(pp->locallab.selspot).HHmaskexpcurve = pe->locallab.spots.at(pp->locallab.selspot).HHmaskexpcurve || !HHmaskexpshape->isUnChanged();
@@ -3628,6 +3633,7 @@ void Locallab::write(ProcParams* pp, ParamsEdited* pedited)
                         pedited->locallab.spots.at(pp->locallab.selspot).excurve = pedited->locallab.spots.at(pp->locallab.selspot).excurve || !shapeexpos->isUnChanged();
                         pedited->locallab.spots.at(pp->locallab.selspot).inversex = pedited->locallab.spots.at(pp->locallab.selspot).inversex || !inversex->get_inconsistent();
                         pedited->locallab.spots.at(pp->locallab.selspot).enaExpMask = pedited->locallab.spots.at(pp->locallab.selspot).enaExpMask || !enaExpMask->get_inconsistent();
+                        pedited->locallab.spots.at(pp->locallab.selspot).enaExpMaskaft = pedited->locallab.spots.at(pp->locallab.selspot).enaExpMaskaft || !enaExpMaskaft->get_inconsistent();
                         pedited->locallab.spots.at(pp->locallab.selspot).CCmaskexpcurve = pedited->locallab.spots.at(pp->locallab.selspot).CCmaskexpcurve || !CCmaskexpshape->isUnChanged();
                         pedited->locallab.spots.at(pp->locallab.selspot).LLmaskexpcurve = pedited->locallab.spots.at(pp->locallab.selspot).LLmaskexpcurve || !LLmaskexpshape->isUnChanged();
                         pedited->locallab.spots.at(pp->locallab.selspot).HHmaskexpcurve = pedited->locallab.spots.at(pp->locallab.selspot).HHmaskexpcurve || !HHmaskexpshape->isUnChanged();
@@ -4685,6 +4691,30 @@ void Locallab::enaExpMaskChanged()
     }
 }
 
+void Locallab::enaExpMaskaftChanged()
+{
+    // printf("enaExpMaskChanged\n");
+
+    if (multiImage) {
+        if (enaExpMaskaft->get_inconsistent()) {
+            enaExpMaskaft->set_inconsistent(false);
+            enaExpMaskaftConn.block(true);
+            enaExpMaskaft->set_active(false);
+            enaExpMaskaftConn.block(false);
+        }
+    }
+
+    if (getEnabled() && expexpose->getEnabled()) {
+        if (listener) {
+            if (enaExpMaskaft->get_active()) {
+                listener->panelChanged(EvLocallabEnaExpMaskaft, M("GENERAL_ENABLED"));
+            } else {
+                listener->panelChanged(EvLocallabEnaExpMaskaft, M("GENERAL_DISABLED"));
+            }
+        }
+    }
+}
+
 void Locallab::enaSHMaskChanged()
 {
     // printf("enaSHMaskChanged\n");
@@ -7293,6 +7323,7 @@ void Locallab::enableListener()
     expMethodConn.block(false);
     exnoiseMethodConn.block(false);
     enaExpMaskConn.block(false);
+    enaExpMaskaftConn.block(false);
     // Shadow highlight
     enableshadhighConn.block(false);
     showmaskSHMethodConn.block(false);
@@ -7370,6 +7401,7 @@ void Locallab::disableListener()
     expMethodConn.block(true);
     exnoiseMethodConn.block(true);
     enaExpMaskConn.block(true);
+    enaExpMaskaftConn.block(true);
     // Shadow highlight
     enableshadhighConn.block(true);
     showmaskSHMethodConn.block(true);
@@ -7501,6 +7533,7 @@ void Locallab::updateLocallabGUI(const rtengine::procparams::ProcParams* pp, con
         shapeexpos->setCurve(pp->locallab.spots.at(index).excurve);
         inversex->set_active(pp->locallab.spots.at(index).inversex);
         enaExpMask->set_active(pp->locallab.spots.at(index).enaExpMask);
+        enaExpMaskaft->set_active(pp->locallab.spots.at(index).enaExpMaskaft);
         CCmaskexpshape->setCurve(pp->locallab.spots.at(index).CCmaskexpcurve);
         LLmaskexpshape->setCurve(pp->locallab.spots.at(index).LLmaskexpcurve);
         HHmaskexpshape->setCurve(pp->locallab.spots.at(index).HHmaskexpcurve);
@@ -7862,6 +7895,7 @@ void Locallab::updateLocallabGUI(const rtengine::procparams::ProcParams* pp, con
                 shapeexpos->setUnChanged(!spotState->excurve);
                 inversex->set_inconsistent(multiImage && !spotState->inversex);
                 enaExpMask->set_inconsistent(multiImage && !spotState->enaExpMask);
+                enaExpMaskaft->set_inconsistent(multiImage && !spotState->enaExpMaskaft);
                 CCmaskexpshape->setUnChanged(!spotState->CCmaskexpcurve);
                 LLmaskexpshape->setUnChanged(!spotState->LLmaskexpcurve);
                 HHmaskexpshape->setUnChanged(!spotState->HHmaskexpcurve);
diff --git a/rtgui/locallab.h b/rtgui/locallab.h
index bca79068d..f10e1635c 100644
--- a/rtgui/locallab.h
+++ b/rtgui/locallab.h
@@ -294,6 +294,8 @@ private:
     // Exposure
     Gtk::CheckButton* const enaExpMask;
     sigc::connection enaExpMaskConn;
+    Gtk::CheckButton* const enaExpMaskaft;
+    sigc::connection enaExpMaskaftConn;
     Gtk::CheckButton* const inversex;
     sigc::connection inversexConn;
     //Shadows highlight
@@ -459,6 +461,7 @@ private:
     void enaColorMaskChanged();
     // Exposure
     void enaExpMaskChanged();
+    void enaExpMaskaftChanged();
     void inversexChanged();
     //Shadows Highlight
     void enaSHMaskChanged();
diff --git a/rtgui/paramsedited.cc b/rtgui/paramsedited.cc
index eac45a210..75379c635 100644
--- a/rtgui/paramsedited.cc
+++ b/rtgui/paramsedited.cc
@@ -1020,6 +1020,7 @@ void ParamsEdited::initFrom(const std::vector<rtengine::procparams::ProcParams>&
                 locallab.spots.at(j).excurve = locallab.spots.at(j).excurve && pSpot.excurve == otherSpot.excurve;
                 locallab.spots.at(j).inversex = locallab.spots.at(j).inversex && pSpot.inversex == otherSpot.inversex;
                 locallab.spots.at(j).enaExpMask = locallab.spots.at(j).enaExpMask && pSpot.enaExpMask == otherSpot.enaExpMask;
+                locallab.spots.at(j).enaExpMaskaft = locallab.spots.at(j).enaExpMaskaft && pSpot.enaExpMaskaft == otherSpot.enaExpMaskaft;
                 locallab.spots.at(j).CCmaskexpcurve = locallab.spots.at(j).CCmaskexpcurve && pSpot.CCmaskexpcurve == otherSpot.CCmaskexpcurve;
                 locallab.spots.at(j).LLmaskexpcurve = locallab.spots.at(j).LLmaskexpcurve && pSpot.LLmaskexpcurve == otherSpot.LLmaskexpcurve;
                 locallab.spots.at(j).HHmaskexpcurve = locallab.spots.at(j).HHmaskexpcurve && pSpot.HHmaskexpcurve == otherSpot.HHmaskexpcurve;
@@ -2948,6 +2949,10 @@ void ParamsEdited::combine(rtengine::procparams::ProcParams& toEdit, const rteng
             toEdit.locallab.spots.at(i).enaExpMask = mods.locallab.spots.at(i).enaExpMask;
         }
 
+        if (locallab.spots.at(i).enaExpMaskaft) {
+            toEdit.locallab.spots.at(i).enaExpMaskaft = mods.locallab.spots.at(i).enaExpMaskaft;
+        }
+
         if (locallab.spots.at(i).CCmaskexpcurve) {
             toEdit.locallab.spots.at(i).CCmaskexpcurve = mods.locallab.spots.at(i).CCmaskexpcurve;
         }
@@ -4718,6 +4723,7 @@ LocallabParamsEdited::LocallabSpotEdited::LocallabSpotEdited(bool v) :
     excurve(v),
     inversex(v),
     enaExpMask(v),
+    enaExpMaskaft(v),
     CCmaskexpcurve(v),
     LLmaskexpcurve(v),
     HHmaskexpcurve(v),
@@ -4983,6 +4989,7 @@ void LocallabParamsEdited::LocallabSpotEdited::set(bool v)
     excurve = v;
     inversex = v;
     enaExpMask = v;
+    enaExpMaskaft = v;
     CCmaskexpcurve = v;
     LLmaskexpcurve = v;
     HHmaskexpcurve = v;
diff --git a/rtgui/paramsedited.h b/rtgui/paramsedited.h
index 80026b749..34877c8f2 100644
--- a/rtgui/paramsedited.h
+++ b/rtgui/paramsedited.h
@@ -438,6 +438,7 @@ public:
         bool excurve;
         bool inversex;
         bool enaExpMask;
+        bool enaExpMaskaft;
         bool CCmaskexpcurve;
         bool LLmaskexpcurve;
         bool HHmaskexpcurve;