diff --git a/rtdata/languages/default b/rtdata/languages/default
index 1762c83de..cf3e6adc8 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2100,8 +2100,8 @@ TP_LOCALLAB_RESID;Residual Image
 TP_LOCALLAB_CONTRESID;Contrast
 TP_LOCALLAB_RETI;Retinex - Strong local contrast
 TP_LOCALLAB_RETI_NEIGH_VART_TOOLTIP;Adapt these values according to images - if misty images and depending on whether you want to act on the front or the background
-TP_LOCALLAB_LC_FFTW_TOOLTIP;FFT improve quality and allow big radius.\nThe treatment time depends on the surface to be treated.\nDimensions can be reduced by a few pixels to optimize FFTW.
-TP_LOCALLAB_RETI_FFTW_TOOLTIP;FFT improve quality and allow big radius.\nThe treatment time depends on the surface to be treated.\nDimensions can be reduced by a few pixels to optimize FFTW.\nThis optimization is not possible if the 2 delimiters of the Spot (vertical or horizontal) are outside the image
+TP_LOCALLAB_LC_FFTW_TOOLTIP;FFT improve quality and allow big radius.\nThe treatment time depends on the surface to be treated.\nTo be used preferably for large radius.\n\nDimensions can be reduced by a few pixels to optimize FFTW.
+TP_LOCALLAB_RETI_FFTW_TOOLTIP;FFT improve quality and allow big radius.\nThe treatment time depends on the surface to be treated.\nTo be used preferably for large radius.\n\nDimensions can be reduced by a few pixels to optimize FFTW.\nThis optimization is not possible if the 2 delimiters of the Spot (vertical or horizontal) are outside the image
 TP_LOCALLAB_TRANSMISSIONGAIN;Transmission gain
 TP_LOCALLAB_STREN;Compression Strength
 TP_LOCALLAB_STRGRID;Strength
diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index 3674613ec..e236335e0 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -4100,7 +4100,7 @@ void ImProcFunctions::fftw_convol_blur(float *input, float *output, int bfw, int
             for(int j = 0; j < bfh; j++){
                 int index = j * bfw;
                 for(int i = 0; i < bfw; i++)
-                    out[i + index] *= exp((float)(-radius)*(n_x * i * i + n_y * j * j));//apply Gauss kernel whithout FFT
+                    out[i + index] *= exp((float)(-radius)*(n_x * i * i + n_y * j * j));//apply Gauss kernel whithout FFT - some authors says radius*radius but huge differences with Gaussianblur
             } 
         } else if(algo == 1) {
 #ifdef _OPENMP
diff --git a/rtengine/ipretinex.cc b/rtengine/ipretinex.cc
index cfd03b2b5..b75360f32 100644
--- a/rtengine/ipretinex.cc
+++ b/rtengine/ipretinex.cc
@@ -979,7 +979,7 @@ void ImProcFunctions::MSRLocal(int sp, bool fftw, int lum, LabImage * bufreti, L
                 float ka = 19.f / 4600.f;
                 float kb = 1.f - 400 * ka;
                 kr = ka * sigm + kb;
-                float kga = -0.5f / 4600.f;
+                float kga = -0.14f / 4600.f;//decrease
                 float kgb = 1.f - 400.f * kga;
                 kg = kga * sigm + kgb;
                 if(sigm > 5000.f) {