small change to take into account new scale with iterations

rtengine/ipretinex.cc

@@ -297,7 +297,7 @@ void RawImageSource::MSR(float** luminance, float** originalLuminance, float **e
 
             if(gradient == 0) {
                 grad = 1.f;
-                sc = scal;//3.f
+                sc = 3.f;
             } else if(gradient == 1) {
                 grad = 0.25f * it + 0.75f;
                 sc = -0.5f * it + 4.5f;
@@ -339,6 +339,19 @@ void RawImageSource::MSR(float** luminance, float** originalLuminance, float **e
 
             if(iter == 1) {
                 sc = scal;
+            } else {
+                //adjust sc in function of choice of scale by user if iterations
+                if(scal < 3) {
+                    sc -= 1;
+
+                    if(sc < 1.f) {//avoid 0
+                        sc = 1.f;
+                    }
+                }
+
+                if(scal > 4) {
+                    sc += 1;
+                }
             }
 
             float varx;

rtengine/procparams.cc

@@ -158,7 +158,7 @@ void RetinexParams::setDefaults()
 {
     enabled = false;
     str      = 20;
-    scal        = 0;
+    scal        = 3;
     iter = 1;
     grad = 1;
     grads = 1;

rtengine/rawimagesource.cc

@@ -2234,7 +2234,6 @@ void RawImageSource::retinexPrepareCurves(RetinexParams retinexParams, LUTf &cdc
 
 void RawImageSource::retinex(ColorManagementParams cmp, RetinexParams deh, ToneCurveParams Tc, LUTf & cdcurve, LUTf & mapcurve, const RetinextransmissionCurve & dehatransmissionCurve, const RetinexgaintransmissionCurve & dehagaintransmissionCurve, multi_array2D<float, 4> &conversionBuffer, bool dehacontlutili, bool mapcontlutili, bool useHsl, float &minCD, float &maxCD, float &mini, float &maxi, float &Tmean, float &Tsigma, float &Tmin, float &Tmax, LUTu &histLRETI)
 {
-
     MyTime t4, t5;
     t4.set();