diff --git a/rtengine/curves.h b/rtengine/curves.h
index 71875fa94..5769cada1 100644
--- a/rtengine/curves.h
+++ b/rtengine/curves.h
@@ -485,7 +485,7 @@ protected:
     void NURBS_set();
 
 public:
-    DiagonalCurve(const std::vector<double>& points, int ppn = CURVES_MIN_POLY_POINTS);
+    explicit DiagonalCurve(const std::vector<double>& points, int ppn = CURVES_MIN_POLY_POINTS);
     ~DiagonalCurve() override;
 
     double getVal(double t) const override;
@@ -510,7 +510,7 @@ private:
 
 public:
 
-    FlatCurve(const std::vector<double>& points, bool isPeriodic = true, int ppn = CURVES_MIN_POLY_POINTS);
+    explicit FlatCurve(const std::vector<double>& points, bool isPeriodic = true, int ppn = CURVES_MIN_POLY_POINTS);
     ~FlatCurve() override;
 
     double getVal(double t) const override;
diff --git a/rtengine/improcfun.h b/rtengine/improcfun.h
index 3af1e0ec6..57c8c4c64 100644
--- a/rtengine/improcfun.h
+++ b/rtengine/improcfun.h
@@ -110,12 +110,6 @@ class ImProcFunctions
     double scale;
     bool multiThread;
 
-    bool lastcutpast;
-    int lastcxbuf;
-    int lastcybuf;
-    int lastcount;
-    LabImage *spotbuffer;
-
     void calcVignettingParams(int oW, int oH, const procparams::VignettingParams& vignetting, double &w2, double &h2, double& maxRadius, double &v, double &b, double &mul);
 
     void transformLuminanceOnly(Imagefloat* original, Imagefloat* transformed, int cx, int cy, int oW, int oH, int fW, int fH);
diff --git a/rtengine/simpleprocess.cc b/rtengine/simpleprocess.cc
index bf382f3d9..8eae9daba 100644
--- a/rtengine/simpleprocess.cc
+++ b/rtengine/simpleprocess.cc
@@ -1226,14 +1226,14 @@ private:
 
                 //provisory
                 double ecomp = params.locallab.spots.at(sp).expcomp;
-                double black = params.locallab.spots.at(sp).black;
-                double hlcompr = params.locallab.spots.at(sp).hlcompr;
-                double hlcomprthresh = params.locallab.spots.at(sp).hlcomprthresh;
+                double lblack = params.locallab.spots.at(sp).black;
+                double lhlcompr = params.locallab.spots.at(sp).hlcompr;
+                double lhlcomprthresh = params.locallab.spots.at(sp).hlcomprthresh;
                 double shcompr = params.locallab.spots.at(sp).shcompr;
                 double br = params.locallab.spots.at(sp).lightness;
                 double cont = params.locallab.spots.at(sp).contrast;
-                if(black < 0. && params.locallab.spots.at(sp).expMethod == "pde" ) {
-                    black *= 1.5;
+                if (lblack < 0. && params.locallab.spots.at(sp).expMethod == "pde" ) {
+                    lblack *= 1.5;
                 }
 
                 // Reference parameters computation
@@ -1245,7 +1245,7 @@ private:
                 } else {
                     ipf.calc_ref(sp, labView, labView, 0, 0, fw, fh, 1, huerefblu, chromarefblu, lumarefblu, huere, chromare, lumare, sobelre, avge, locwavCurveden, locwavdenutili);
                 }
-                CurveFactory::complexCurvelocal(ecomp, black / 65535., hlcompr, hlcomprthresh, shcompr, br, cont, lumare,
+                CurveFactory::complexCurvelocal(ecomp, lblack / 65535., lhlcompr, lhlcomprthresh, shcompr, br, cont, lumare,
                                                 hltonecurveloc, shtonecurveloc, tonecurveloc, lightCurveloc, avge,
                                                 1);
                 float minCD;