diff --git a/rtdata/languages/default b/rtdata/languages/default
index f00d9411e..9fa208280 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -1216,6 +1216,7 @@ HISTORY_MSG_COLORTONING_LABREGION_SATURATION;CT - Saturation
 HISTORY_MSG_COLORTONING_LABREGION_SHOWMASK;CT - region show mask
 HISTORY_MSG_COLORTONING_LABREGION_SLOPE;CT - region slope
 HISTORY_MSG_COMPLEX;Wavelet complexity
+HISTORY_MSG_COMPLEXRETI;Retinex complexity
 HISTORY_MSG_DEHAZE_DEPTH;Dehaze - Depth
 HISTORY_MSG_DEHAZE_ENABLED;Haze Removal
 HISTORY_MSG_DEHAZE_LUMINANCE;Dehaze - Luminance only
diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index a12ab4ba4..3d1f3e071 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -459,6 +459,7 @@ RetinexParams::RetinexParams() :
     shadows(0),
     stonalwidth(80),
     radius(40),
+    complexmethod("normal"),
     retinexMethod("high"),
     retinexcolorspace("Lab"),
     gammaretinex("none"),
@@ -496,6 +497,7 @@ bool RetinexParams::operator ==(const RetinexParams& other) const
         && shadows == other.shadows
         && stonalwidth == other.stonalwidth
         && radius == other.radius
+        && complexmethod == other.complexmethod
         && retinexMethod == other.retinexMethod
         && retinexcolorspace == other.retinexcolorspace
         && gammaretinex == other.gammaretinex
@@ -5027,6 +5029,7 @@ int ProcParams::save(const Glib::ustring& fname, const Glib::ustring& fname2, bo
         saveToKeyfile(!pedited || pedited->retinex.limd, "Retinex", "Limd", retinex.limd, keyFile);
         saveToKeyfile(!pedited || pedited->retinex.highl, "Retinex", "highl", retinex.highl, keyFile);
         saveToKeyfile(!pedited || pedited->retinex.skal, "Retinex", "skal", retinex.skal, keyFile);
+        saveToKeyfile(!pedited || pedited->retinex.complexmethod, "Retinex", "complexMethod", retinex.complexmethod, keyFile);
         saveToKeyfile(!pedited || pedited->retinex.retinexMethod, "Retinex", "RetinexMethod", retinex.retinexMethod, keyFile);
         saveToKeyfile(!pedited || pedited->retinex.mapMethod, "Retinex", "mapMethod", retinex.mapMethod, keyFile);
         saveToKeyfile(!pedited || pedited->retinex.viewMethod, "Retinex", "viewMethod", retinex.viewMethod, keyFile);
@@ -6497,6 +6500,7 @@ int ProcParams::load(const Glib::ustring& fname, ParamsEdited* pedited)
 
         if (keyFile.has_group("Retinex")) {
             assignFromKeyfile(keyFile, "Retinex", "Median", pedited, retinex.medianmap, pedited->retinex.medianmap);
+            assignFromKeyfile(keyFile, "Retinex", "complexMethod", pedited, retinex.complexmethod, pedited->retinex.complexmethod);
             assignFromKeyfile(keyFile, "Retinex", "RetinexMethod", pedited, retinex.retinexMethod, pedited->retinex.retinexMethod);
             assignFromKeyfile(keyFile, "Retinex", "mapMethod", pedited, retinex.mapMethod, pedited->retinex.mapMethod);
             assignFromKeyfile(keyFile, "Retinex", "viewMethod", pedited, retinex.viewMethod, pedited->retinex.viewMethod);
diff --git a/rtengine/procparams.h b/rtengine/procparams.h
index 048fe1ee5..0af03eaee 100644
--- a/rtengine/procparams.h
+++ b/rtengine/procparams.h
@@ -336,6 +336,7 @@ struct RetinexParams {
     int     stonalwidth;
     int     radius;
 
+    Glib::ustring complexmethod;
     Glib::ustring retinexMethod;
     Glib::ustring retinexcolorspace;
     Glib::ustring gammaretinex;
diff --git a/rtgui/paramsedited.cc b/rtgui/paramsedited.cc
index 070e31316..3cd93064e 100644
--- a/rtgui/paramsedited.cc
+++ b/rtgui/paramsedited.cc
@@ -60,6 +60,7 @@ void ParamsEdited::set(bool v)
     retinex.mapcurve    = v;
     retinex.cdHcurve    = v;
     retinex.lhcurve    = v;
+    retinex.complexmethod    = v;
     retinex.retinexMethod    = v;
     retinex.mapMethod    = v;
     retinex.viewMethod    = v;
@@ -711,6 +712,7 @@ void ParamsEdited::initFrom(const std::vector<rtengine::procparams::ProcParams>&
         retinex.lhcurve = retinex.lhcurve && p.retinex.lhcurve == other.retinex.lhcurve;
         retinex.transmissionCurve = retinex.transmissionCurve && p.retinex.transmissionCurve == other.retinex.transmissionCurve;
         retinex.gaintransmissionCurve = retinex.gaintransmissionCurve && p.retinex.gaintransmissionCurve == other.retinex.gaintransmissionCurve;
+        retinex.complexmethod = retinex.complexmethod && p.retinex.complexmethod == other.retinex.complexmethod;
         retinex.retinexMethod = retinex.retinexMethod && p.retinex.retinexMethod == other.retinex.retinexMethod;
         retinex.mapMethod = retinex.mapMethod && p.retinex.mapMethod == other.retinex.mapMethod;
         retinex.viewMethod = retinex.viewMethod && p.retinex.viewMethod == other.retinex.viewMethod;
@@ -1917,6 +1919,10 @@ void ParamsEdited::combine(rtengine::procparams::ProcParams& toEdit, const rteng
         toEdit.retinex.gaintransmissionCurve = mods.retinex.gaintransmissionCurve;
     }
 
+    if (retinex.complexmethod) {
+        toEdit.retinex.complexmethod = mods.retinex.complexmethod;
+    }
+
     if (retinex.retinexMethod) {
         toEdit.retinex.retinexMethod = mods.retinex.retinexMethod;
     }
diff --git a/rtgui/paramsedited.h b/rtgui/paramsedited.h
index 57b6458b9..f8230a577 100644
--- a/rtgui/paramsedited.h
+++ b/rtgui/paramsedited.h
@@ -73,6 +73,7 @@ struct RetinexParamsEdited {
     bool slope;
     bool neigh;
     bool offs;
+    bool complexmethod;
     bool retinexMethod;
     bool mapMethod;
     bool viewMethod;
diff --git a/rtgui/retinex.cc b/rtgui/retinex.cc
index 2fdd8f319..feab8e6a5 100644
--- a/rtgui/retinex.cc
+++ b/rtgui/retinex.cc
@@ -9,6 +9,7 @@
 #include "rtimage.h"
 #include "options.h"
 #include "../rtengine/color.h"
+#include "eventmapper.h"
 
 using namespace rtengine;
 using namespace rtengine::procparams;
@@ -25,13 +26,26 @@ Retinex::Retinex () : FoldableToolPanel (this, "retinex", M ("TP_RETINEX_LABEL")
     nextsigma = 0.;
     nextminT = 0.;
     nextmaxT = 0.;
+    auto m = ProcEventMapper::getInstance();
+    EvReticomplex = m->newEvent(DEMOSAIC, "HISTORY_MSG_COMPLEXRETI");
 
 
+    const RetinexParams default_params;
 
 
     // MAIN Expander ==================================================================
 
+    complexmethod = Gtk::manage (new MyComboBoxText ());
 
+    complexmethod->append(M("TP_WAVELET_COMPNORMAL"));
+    complexmethod->append(M("TP_WAVELET_COMPEXPERT"));
+    complexmethodconn = complexmethod->signal_changed().connect(sigc::mem_fun(*this, &Retinex::complexmethodChanged));
+    complexmethod->set_tooltip_text(M("TP_WAVELET_COMPLEX_TOOLTIP"));
+    Gtk::HBox* const complexHBox = Gtk::manage(new Gtk::HBox());
+    Gtk::Label* const complexLabel = Gtk::manage(new Gtk::Label(M("TP_WAVELET_COMPLEXLAB") + ":"));
+    complexHBox->pack_start(*complexLabel, Gtk::PACK_SHRINK, 4);
+    complexHBox->pack_start(*complexmethod);
+    pack_start(*complexHBox);
 
 
     Gtk::Grid *retinexGrid = Gtk::manage ( new Gtk::Grid());
@@ -116,7 +130,8 @@ Retinex::Retinex () : FoldableToolPanel (this, "retinex", M ("TP_RETINEX_LABEL")
     // MAP (MASK) Frame ---------------------------------------------------------------
 
 
-    Gtk::Frame *maskFrame = Gtk::manage (new Gtk::Frame (M ("TP_RETINEX_LABEL_MASK")) );
+ //   Gtk::Frame *maskFrame = Gtk::manage (new Gtk::Frame (M ("TP_RETINEX_LABEL_MASK")) );
+    maskFrame = Gtk::manage (new Gtk::Frame (M ("TP_RETINEX_LABEL_MASK")) );
     setExpandAlignProperties (maskFrame, true, false, Gtk::ALIGN_FILL, Gtk::ALIGN_START);
 
     Gtk::Grid *maskGrid = Gtk::manage ( new Gtk::Grid());
@@ -384,7 +399,6 @@ Retinex::Retinex () : FoldableToolPanel (this, "retinex", M ("TP_RETINEX_LABEL")
     Gtk::Grid *tranGrid = Gtk::manage (new Gtk::Grid());
     setExpandAlignProperties (tranGrid, true, false, Gtk::ALIGN_FILL, Gtk::ALIGN_START);
 
-    const RetinexParams default_params;
 
     // Transmission map curve
     transmissionCurveEditorG = new CurveEditorGroup (options.lastRetinexDir, M ("TP_RETINEX_TRANSMISSION"));
@@ -628,12 +642,14 @@ void Retinex::neutral_pressed ()
     limd->resetValue (false);
     highl->resetValue (false);
     gam->resetValue (false);
+    skal->resetValue (false);
     slope->resetValue (false);
     highlights->resetValue (false);
     h_tonalwidth->resetValue (false);
     shadows->resetValue (false);
     s_tonalwidth->resetValue (false);
     radius->resetValue (false);
+    medianmap->set_active (false);
     mapMethod->set_active (0);
     viewMethod->set_active (0);
     retinexMethod->set_active (2);
@@ -742,7 +758,53 @@ void Retinex::updateTrans ()
     }
 }
 
+void Retinex::convertParamToNormal()
+{
+    const RetinexParams def_params;
+    disableListener();
+    iter->setValue(def_params.iter);
+    viewMethod->set_active(0);
+    mapMethod->set_active(0);
+    cdshape->reset();
+    cdshapeH->reset();
+    lhshape->reset();
+    transmissionShape->reset();
+    medianmap->set_active(def_params.medianmap);
+    enableListener();
+}
 
+void Retinex::updateGUIToMode(int mode)
+{
+
+    if(mode ==0) {
+        iterFrame->hide();
+        maskFrame->hide();
+        equalFrame->hide();
+        viewMethod->hide();
+        mapMethod->hide();
+        transmissionCurveEditorG->hide();
+        medianmap->hide();
+    } else {
+        iterFrame->show();
+        maskFrame->show();
+        equalFrame->show();
+        viewMethod->show();
+        transmissionCurveEditorG->show();
+        medianmap->show();
+        mapMethod->show();
+       if (iter->getIntValue() > 1) {
+            grad->set_sensitive (true);
+            scal->set_sensitive (true);
+            grads->set_sensitive (true);
+       } else {
+            grad->set_sensitive (false);
+            scal->set_sensitive (false);
+            grads->set_sensitive (false);
+       }
+
+    }
+
+}
 
 void Retinex::read (const ProcParams* pp, const ParamsEdited* pedited)
 {
@@ -752,6 +814,7 @@ void Retinex::read (const ProcParams* pp, const ParamsEdited* pedited)
     gammaretinexConn.block (true);
     mapMethodConn.block (true);
     viewMethodConn.block (true);
+    complexmethodconn.block (true);
 
 
     if (pedited) {
@@ -775,6 +838,9 @@ void Retinex::read (const ProcParams* pp, const ParamsEdited* pedited)
         shadows->setEditedState      (pedited->retinex.shadows ? Edited : UnEdited);
         s_tonalwidth->setEditedState (pedited->retinex.stonalwidth ? Edited : UnEdited);
 
+        if (!pedited->retinex.complexmethod) {
+            complexmethod->set_active_text (M ("GENERAL_UNCHANGED"));
+        }
 
         if (!pedited->retinex.retinexMethod) {
             retinexMethod->set_active_text (M ("GENERAL_UNCHANGED"));
@@ -844,6 +910,13 @@ void Retinex::read (const ProcParams* pp, const ParamsEdited* pedited)
     medianmapConn.block (false);
     lastmedianmap = pp->retinex.medianmap;
 
+    if (pp->retinex.complexmethod == "normal") {
+        complexmethod->set_active(0);
+    } else if (pp->retinex.complexmethod == "expert") {
+        complexmethod->set_active(1);
+    }
+
+
     if (pp->retinex.retinexMethod == "low") {
         retinexMethod->set_active (0);
     } else if (pp->retinex.retinexMethod == "uni") {
@@ -906,6 +979,7 @@ void Retinex::read (const ProcParams* pp, const ParamsEdited* pedited)
     mapMethodChanged ();
     viewMethodChanged ();
 
+
     medianmapConn.block (true);
     medianmapChanged ();
     medianmapConn.block (false);
@@ -914,7 +988,7 @@ void Retinex::read (const ProcParams* pp, const ParamsEdited* pedited)
     cdshapeH->setCurve  (pp->retinex.cdHcurve);
     lhshape->setCurve  (pp->retinex.lhcurve);
     mapshape->setCurve  (pp->retinex.mapcurve);
-
+    
     retinexMethodConn.block (false);
     retinexColorSpaceConn.block (false);
     gammaretinexConn.block (false);
@@ -923,8 +997,18 @@ void Retinex::read (const ProcParams* pp, const ParamsEdited* pedited)
     transmissionShape->setCurve (pp->retinex.transmissionCurve);
     gaintransmissionShape->setCurve (pp->retinex.gaintransmissionCurve);
 
+    complexmethodconn.block (false);
 
     enableListener ();
+    
+    if (complexmethod->get_active_row_number() == 0) {
+        updateGUIToMode(0);
+       // convertParamToNormal();
+
+    } else {
+        updateGUIToMode(1);
+    }
+    
 }
 
 
@@ -961,6 +1045,7 @@ void Retinex::write (ProcParams* pp, ParamsEdited* pedited)
     pp->retinex.stonalwidth   = (int)s_tonalwidth->getValue ();
 
     if (pedited) {
+        pedited->retinex.complexmethod    = complexmethod->get_active_text() != M ("GENERAL_UNCHANGED");
         pedited->retinex.retinexMethod    = retinexMethod->get_active_text() != M ("GENERAL_UNCHANGED");
         pedited->retinex.retinexcolorspace    = retinexcolorspace->get_active_text() != M ("GENERAL_UNCHANGED");
         pedited->retinex.gammaretinex    = gammaretinex->get_active_text() != M ("GENERAL_UNCHANGED");
@@ -998,6 +1083,12 @@ void Retinex::write (ProcParams* pp, ParamsEdited* pedited)
 
     }
 
+    if (complexmethod->get_active_row_number() == 0) {
+        pp->retinex.complexmethod = "normal";
+    } else if (complexmethod->get_active_row_number() == 1) {
+        pp->retinex.complexmethod = "expert";
+    }
+
     if (retinexMethod->get_active_row_number() == 0) {
         pp->retinex.retinexMethod = "low";
     } else if (retinexMethod->get_active_row_number() == 1) {
@@ -1056,6 +1147,27 @@ void Retinex::write (ProcParams* pp, ParamsEdited* pedited)
 
 }
 
+void Retinex::complexmethodChanged()
+{
+
+    if (!batchMode) {
+        if (complexmethod->get_active_row_number() == 0) {
+            updateGUIToMode(0);
+            convertParamToNormal();
+
+        } else {
+            updateGUIToMode(1);
+        }
+    }
+
+    if (listener) {
+        listener->panelChanged(EvReticomplex, complexmethod->get_active_text());
+    }
+
+}
+
+
+
 void Retinex::retinexMethodChanged()
 {
 
@@ -1138,8 +1250,11 @@ void Retinex::viewMethodChanged()
             limd->show();
             transmissionCurveEditorG->show();
             medianmap->show();
-
-            iterFrame->show();
+            if (complexmethod->get_active_row_number() == 0) {
+                iterFrame->hide();
+            } else {
+                iterFrame->show();
+            }
             /*
             iter->show();
             scal->show();
@@ -1522,6 +1637,7 @@ void Retinex::setBatchMode (bool batchMode)
     h_tonalwidth->showEditedCB ();
     shadows->showEditedCB ();
     s_tonalwidth->showEditedCB ();
+  //  complexmethod->append(M("GENERAL_UNCHANGED"));
 
     skal->showEditedCB ();
     curveEditorGD->setBatchMode (batchMode);
diff --git a/rtgui/retinex.h b/rtgui/retinex.h
index dea65daab..bf480c9cc 100644
--- a/rtgui/retinex.h
+++ b/rtgui/retinex.h
@@ -28,6 +28,7 @@ class Retinex final :
 {
 private:
     IdleRegister idle_register;
+    rtengine::ProcEvent EvReticomplex;
 
 protected:
     CurveEditorGroup* curveEditorGD;
@@ -72,6 +73,9 @@ protected:
     MyComboBoxText*   mapMethod;
     MyComboBoxText*   viewMethod;
     Gtk::CheckButton* medianmap;
+    MyComboBoxText* complexmethod;
+    sigc::connection  complexmethodconn;
+    
     double nextmin;
     double nextmax;
     double nextminiT;
@@ -87,6 +91,7 @@ protected:
     Gtk::Frame *gainFrame;
     Gtk::Frame *tranFrame;
     Gtk::Frame *iterFrame;
+    Gtk::Frame *maskFrame;
     Gtk::Frame *equalFrame;
 
     DiagonalCurveEditor* cdshape;
@@ -148,4 +153,7 @@ public:
 
 private:
     void foldAllButMe(GdkEventButton* event, MyExpander *expander);
+    void convertParamToNormal();
+    void updateGUIToMode(int mode);
+    void complexmethodChanged();
 };
diff --git a/rtgui/wavelet.cc b/rtgui/wavelet.cc
index 8bd074867..19d458dad 100644
--- a/rtgui/wavelet.cc
+++ b/rtgui/wavelet.cc
@@ -2920,8 +2920,8 @@ void Wavelet::convertParamToNormal()
 
     //final touchup
     BAmethod->set_active(0);    
-    enableListener();
     sigmafin->setValue(def_params.sigmafin);
+    enableListener();
 
     // Update GUI based on converted widget parameters:
 }