diff --git a/rtdata/languages/default b/rtdata/languages/default
index e1897f99d..ce27e20ae 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2325,6 +2325,7 @@ TP_LOCALLAB_CHROMACBDL;Chroma
 TP_LOCALLAB_CHROMACB_TOOLTIP;Acts as an amplifier-reducer action compare to sliders of luminance.\nUnder 100 reduce, above 100 amplifie
 TP_LOCALLAB_CHROMALEV;Chroma levels
 TP_LOCALLAB_CHROMABLU;Chroma levels
+TP_LOCALLAB_CHROMABLU_TOOLTIP;Acts as an amplifier-reducer action compare to settings of luma.\nUnder 1 reduce, above 1 amplifie
 TP_LOCALLAB_CHROMASKCOL;Chroma mask
 TP_LOCALLAB_CHROMASK_TOOLTIP;You can use this slider to desaturated background (inverse mask - curve near 0).\nAlso to attenuate or enhance the action of a mask on the chroma
 TP_LOCALLAB_CHRRT;Chroma
diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index df7d46581..93c92b5f2 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -8704,7 +8704,7 @@ void ImProcFunctions::wavcontrast4(struct local_params& lp, float ** tmp, float
                 return;
             }
 
-            if (wavcurvelev && radlevblur > 0.f) {
+            if (wavcurvelev && radlevblur > 0.f && chromablu > 0.f) {
                 wavcont(lp, tmp, *wdspota, templevela, level_bl, maxlvl, loclevwavCurve, loclevwavutili, loccompwavCurve, loccompwavutili, loccomprewavCurve, loccomprewavutili, radlevblur, 1, chromablu, 0.f, 0.f, 0.f);
             }
 
@@ -8759,7 +8759,7 @@ void ImProcFunctions::wavcontrast4(struct local_params& lp, float ** tmp, float
                 return;
             }
 
-            if (wavcurvelev && radlevblur > 0.f) {
+            if (wavcurvelev && radlevblur > 0.f && chromablu > 0.f) {
                 wavcont(lp, tmp, *wdspotb, templevelb, level_bl, maxlvl, loclevwavCurve, loclevwavutili, loccompwavCurve, loccompwavutili, loccomprewavCurve, loccomprewavutili, radlevblur, 1, chromablu, 0.f, 0.f, 0.f);
             }
 
diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index 3f5744e11..522f65aa9 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -3353,7 +3353,7 @@ LocallabParams::LocallabSpot::LocallabSpot() :
     sigmadr(1.0),
     threswav(1.4),
     chromalev(1.0),
-    chromablu(1.0),
+    chromablu(0.0),
     sigmadc(1.0),
     deltad(0.0),
     fatres(0.0),
@@ -3372,7 +3372,7 @@ LocallabParams::LocallabSpot::LocallabSpot() :
     thigw(0.0),
     edgw(60.0),
     basew(10.0),
-    sensilc(30),
+    sensilc(50),
     fftwlc(false),
     blurlc(true),
     wavblur(false),
diff --git a/rtgui/locallabtools2.cc b/rtgui/locallabtools2.cc
index 291bd7c88..a3a16647a 100644
--- a/rtgui/locallabtools2.cc
+++ b/rtgui/locallabtools2.cc
@@ -2015,7 +2015,7 @@ LocallabContrast::LocallabContrast():
     residshathr(Gtk::manage(new Adjuster(M("TP_LOCALLAB_RESIDSHATHR"), 0., 100., 1., 30.))),
     residhi(Gtk::manage(new Adjuster(M("TP_LOCALLAB_RESIDHI"), -100., 100., 1., 0.))),
     residhithr(Gtk::manage(new Adjuster(M("TP_LOCALLAB_RESIDHITHR"), 0., 100., 1., 70.))),
-    sensilc(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SENSIS"), 0, 100, 1, 30))),
+    sensilc(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SENSIS"), 0, 100, 1, 50))),
     clariFrame(Gtk::manage(new Gtk::Frame(M("TP_LOCALLAB_CLARIFRA")))),
     clarilres(Gtk::manage(new Adjuster(M("TP_LOCALLAB_CLARILRES"), -20., 100., 0.5, 0.))),
     claricres(Gtk::manage(new Adjuster(M("TP_LOCALLAB_CLARICRES"), -20., 100., 0.5, 0.))),
@@ -2050,7 +2050,7 @@ LocallabContrast::LocallabContrast():
     wavblur(Gtk::manage(new Gtk::CheckButton(M("TP_LOCALLAB_BLURLEVELFRA")))),
     levelblur(Gtk::manage(new Adjuster(M("TP_LOCALLAB_LEVELBLUR"), 0., 100., 0.5, 0.))),
     sigmabl(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SIGMAWAV"), 0.2, 2.5, 0.01, 1.))),
-    chromablu(Gtk::manage(new Adjuster(M("TP_LOCALLAB_CHROMABLU"), 0.01, 5., 0.01, 1.))),
+    chromablu(Gtk::manage(new Adjuster(M("TP_LOCALLAB_CHROMABLU"), 0.0, 5., 0.1, 0.))),
     LocalcurveEditorwavlev(new CurveEditorGroup(options.lastlocalCurvesDir, M("TP_LOCALLAB_WAVLEV"))),
     wavshapelev(static_cast<FlatCurveEditor*>(LocalcurveEditorwavlev->addCurve(CT_Flat, "", nullptr, false, false))),
     residblur(Gtk::manage(new Adjuster(M("TP_LOCALLAB_RESIDBLUR"), 0., 100., 0.5, 0.))),
@@ -2060,7 +2060,7 @@ LocallabContrast::LocallabContrast():
     wavcont(Gtk::manage(new Gtk::CheckButton(M("TP_LOCALLAB_CONTFRA")))),
     sigma(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SIGMAWAV"), 0.2, 2.5, 0.01, 1.))),
     offset(Gtk::manage(new Adjuster(M("TP_LOCALLAB_OFFSETWAV"), 0.33, 1.66, 0.01, 1., Gtk::manage(new RTImage("circle-black-small.png")), Gtk::manage(new RTImage("circle-white-small.png"))))),
-    chromalev(Gtk::manage(new Adjuster(M("TP_LOCALLAB_CHROMALEV"), 0.01, 5., 0.01, 1.))),
+    chromalev(Gtk::manage(new Adjuster(M("TP_LOCALLAB_CHROMALEV"), 0.1, 5., 0.1, 1.))),
     LocalcurveEditorwavcon(new CurveEditorGroup(options.lastlocalCurvesDir, M("TP_LOCALLAB_WAVCON"))),
     wavshapecon(static_cast<FlatCurveEditor*>(LocalcurveEditorwavcon->addCurve(CT_Flat, "", nullptr, false, false))),
     compreFrame(Gtk::manage(new Gtk::Frame(M("TP_LOCALLAB_COMPREFRA")))),
@@ -2278,6 +2278,11 @@ LocallabContrast::LocallabContrast():
 
     chromalev->setAdjusterListener(this);
 
+    if (showtooltip) {
+        chromalev->set_tooltip_text(M("TP_LOCALLAB_CHROMABLU_TOOLTIP"));
+        chromablu->set_tooltip_text(M("TP_LOCALLAB_CHROMABLU_TOOLTIP"));
+    }
+
     LocalcurveEditorwavcon->setCurveListener(this);
 
     wavshapecon->setIdentityValue(0.);