diff --git a/rtengine/dcrop.cc b/rtengine/dcrop.cc
index 3b1ebfdab..731eca086 100644
--- a/rtengine/dcrop.cc
+++ b/rtengine/dcrop.cc
@@ -1011,6 +1011,8 @@ void Crop::update(int todo)
             parent->ipf.ip_wavelet(labnCrop, labnCrop, kall, WaveParams, wavCLVCurve, waOpacityCurveRG, waOpacityCurveBY, waOpacityCurveW, waOpacityCurveWL, parent->wavclCurve, skip);
         }
 
+        parent->ipf.softLight(labnCrop);        
+
         //     }
 
         //   }
diff --git a/rtengine/improccoordinator.cc b/rtengine/improccoordinator.cc
index 5cc93d3c7..2aaf018fb 100644
--- a/rtengine/improccoordinator.cc
+++ b/rtengine/improccoordinator.cc
@@ -792,7 +792,8 @@ void ImProcCoordinator::updatePreviewImage(int todo, bool panningRelatedChange)
 
             }
 
-
+        ipf.softLight(nprevl);
+        
             if (params.colorappearance.enabled) {
                 //L histo  and Chroma histo for ciecam
                 // histogram well be for Lab (Lch) values, because very difficult to do with J,Q, M, s, C
diff --git a/rtengine/improcfun.cc b/rtengine/improcfun.cc
index 7d9d080e2..57475af9c 100644
--- a/rtengine/improcfun.cc
+++ b/rtengine/improcfun.cc
@@ -3186,7 +3186,7 @@ void ImProcFunctions::rgbProc (Imagefloat* working, LabImage* lab, PipetteBuffer
                     }
                 }
 
-                softLight(rtemp, gtemp, btemp, istart, jstart, tW, tH, TS);
+                //softLight(rtemp, gtemp, btemp, istart, jstart, tW, tH, TS);
                 
                 if (!blackwhite) {
                     if (editImgFloat || editWhatever) {
diff --git a/rtengine/improcfun.h b/rtengine/improcfun.h
index a97ecef40..066d1e306 100644
--- a/rtengine/improcfun.h
+++ b/rtengine/improcfun.h
@@ -343,7 +343,7 @@ public:
     void localContrast(LabImage *lab);
     void colorToningLabGrid(LabImage *lab, int xstart, int xend, int ystart, int yend, bool MultiThread);
     void shadowsHighlights(LabImage *lab);
-    void softLight(float *red, float *green, float *blue, int istart, int jstart, int tW, int tH, int TS);
+    void softLight(LabImage *lab);
 
     Image8*     lab2rgb(LabImage* lab, int cx, int cy, int cw, int ch, const procparams::ColorManagementParams &icm, bool consider_histogram_settings = true);
     Imagefloat*    lab2rgbOut(LabImage* lab, int cx, int cy, int cw, int ch, const procparams::ColorManagementParams &icm);
diff --git a/rtengine/ipsoftlight.cc b/rtengine/ipsoftlight.cc
index 35bf9577a..74fb543aa 100644
--- a/rtengine/ipsoftlight.cc
+++ b/rtengine/ipsoftlight.cc
@@ -26,48 +26,49 @@
 
 namespace rtengine {
 
-void ImProcFunctions::softLight(float *red, float *green, float *blue, int istart, int jstart, int tW, int tH, int TS)
+namespace {
+
+inline float sl(float blend, float x)
+{
+    if (!OOG(x)) {
+        const float orig = 1.f - blend;
+        float v = Color::gamma_srgb(x) / MAXVALF;
+        // Pegtop's formula from
+        // https://en.wikipedia.org/wiki/Blend_modes#Soft_Light
+        float v2 = v * v;
+        float v22 = v2 * 2.f;
+        v = v2 + v22 - v22 * v;
+        x = blend * Color::igamma_srgb(v * MAXVALF) + orig * x;
+    }
+    return x;
+}
+
+} // namespace
+
+
+void ImProcFunctions::softLight(LabImage *lab)
 {
     if (!params->softlight.enabled || !params->softlight.strength) {
         return;
     }
 
+    Imagefloat working(lab->W, lab->H);
+    lab2rgb(*lab, working, params->icm.workingProfile);
+
     const float blend = params->softlight.strength / 100.f;
-    const float orig = 1.f - blend;
-
-    const auto apply =
-        [=](float x) -> float
-        {
-            if (!OOG(x)) {
-                float v = Color::gamma_srgb(x) / MAXVALF;
-                // Pegtop's formula from
-                // https://en.wikipedia.org/wiki/Blend_modes#Soft_Light
-                float v2 = v * v;
-                float v22 = v2 * 2.f;
-                v = v2 + v22 - v22 * v;
-                x = blend * Color::igamma_srgb(v * MAXVALF) + orig * x;
-            }
-            return x;
-        };
 
 #ifdef _OPENMP
-    #pragma omp parallel if (multiThread)
+    #pragma omp parallel for
 #endif
-    {
-        int ti = 0;
-#ifdef _OPENMP
-        #pragma omp for
-#endif
-        for (int i = istart; i < tH; i++) {
-            for (int j = jstart, tj = 0; j < tW; j++, tj++) {
-                const int idx = ti * TS + tj;
-                red[idx] = apply(red[idx]);
-                green[idx] = apply(green[idx]);
-                blue[idx] = apply(blue[idx]);
-            }
-            ++ti;
+    for (int y = 0; y < working.getHeight(); ++y) {
+        for (int x = 0; x < working.getWidth(); ++x) {
+            working.r(y, x) = sl(blend, working.r(y, x));
+            working.g(y, x) = sl(blend, working.g(y, x));
+            working.b(y, x) = sl(blend, working.b(y, x));
         }
     }
+    
+    rgb2lab(working, *lab, params->icm.workingProfile);
 }
 
 } // namespace rtengine
diff --git a/rtengine/rtthumbnail.cc b/rtengine/rtthumbnail.cc
index 79dee36bf..afd8836a1 100644
--- a/rtengine/rtthumbnail.cc
+++ b/rtengine/rtthumbnail.cc
@@ -1368,6 +1368,8 @@ IImage8* Thumbnail::processImage (const procparams::ProcParams& params, eSensorT
         ipf.EPDToneMap (labView, 5, 6);
     }
 
+    ipf.softLight(labView);
+
     if (params.colorappearance.enabled) {
         CurveFactory::curveLightBrightColor (
             params.colorappearance.curve,
diff --git a/rtengine/simpleprocess.cc b/rtengine/simpleprocess.cc
index 06e2b13bf..24301e129 100644
--- a/rtengine/simpleprocess.cc
+++ b/rtengine/simpleprocess.cc
@@ -1135,6 +1135,8 @@ private:
 
         wavCLVCurve.Reset();
 
+        ipf.softLight(labView);
+
         //Colorappearance and tone-mapping associated
 
         int f_w = 1, f_h = 1;
diff --git a/rtgui/softlight.cc b/rtgui/softlight.cc
index 0ee4c64b9..072c45e98 100644
--- a/rtgui/softlight.cc
+++ b/rtgui/softlight.cc
@@ -28,8 +28,8 @@ using namespace rtengine::procparams;
 SoftLight::SoftLight(): FoldableToolPanel(this, "softlight", M("TP_SOFTLIGHT_LABEL"), false, true)
 {
     auto m = ProcEventMapper::getInstance();
-    EvSoftLightEnabled = m->newEvent(RGBCURVE, "HISTORY_MSG_SOFTLIGHT_ENABLED");
-    EvSoftLightStrength = m->newEvent(RGBCURVE, "HISTORY_MSG_SOFTLIGHT_STRENGTH");
+    EvSoftLightEnabled = m->newEvent(LUMINANCECURVE, "HISTORY_MSG_SOFTLIGHT_ENABLED");
+    EvSoftLightStrength = m->newEvent(LUMINANCECURVE, "HISTORY_MSG_SOFTLIGHT_STRENGTH");
     
     strength = Gtk::manage(new Adjuster(M("TP_SOFTLIGHT_STRENGTH"), 0., 100., 1., 30.));
     strength->setAdjusterListener(this);