diff --git a/rtengine/ipsharpen.cc b/rtengine/ipsharpen.cc
index 1d699bb87..8437fae47 100644
--- a/rtengine/ipsharpen.cc
+++ b/rtengine/ipsharpen.cc
@@ -159,7 +159,7 @@ extern const Settings* settings;
 
 void ImProcFunctions::deconvsharpening (float** luminance, float** tmp, int W, int H, const SharpeningParams &sharpenParam)
 {
-    if (sharpenParam.deconvamount == 0) {
+    if (sharpenParam.deconvamount == 0 && sharpenParam.blurradius < 0.25f) {
         return;
     }
 BENCHFUN
@@ -177,7 +177,7 @@ BENCHFUN
     // calculate contrast based blend factors to reduce sharpening in regions with low contrast
     JaggedArray<float> blend(W, H);
     float contrast = sharpenParam.contrast / 100.f;
-    buildBlendMask(luminance, blend, W, H, contrast, sharpenParam.deconvamount / 100.f);
+    buildBlendMask(luminance, blend, W, H, contrast, 1.f);
     JaggedArray<float>* blurbuffer = nullptr;
 
     if (sharpenParam.blurradius >= 0.25f) {
@@ -201,6 +201,7 @@ BENCHFUN
     const float damping = sharpenParam.deconvdamping / 5.0;
     const bool needdamp = sharpenParam.deconvdamping > 0;
     const double sigma = sharpenParam.deconvradius / scale;
+    const float amount = sharpenParam.deconvamount / 100.f;
 
 #ifdef _OPENMP
     #pragma omp parallel
@@ -224,7 +225,7 @@ BENCHFUN
 
         for (int i = 0; i < H; ++i) {
             for (int j = 0; j < W; ++j) {
-                luminance[i][j] = intp(blend[i][j], max(tmpI[i][j], 0.0f), luminance[i][j]);
+                luminance[i][j] = intp(blend[i][j] * amount, max(tmpI[i][j], 0.0f), luminance[i][j]);
             }
         }
 
@@ -256,7 +257,7 @@ void ImProcFunctions::sharpening (LabImage* lab, const SharpeningParams &sharpen
         // calculate contrast based blend factors to reduce sharpening in regions with low contrast
         JaggedArray<float> blend(W, H);
         float contrast = sharpenParam.contrast / 100.f;
-        buildBlendMask(lab->L, blend, W, H, contrast, sharpenParam.method == "rld" ? sharpenParam.deconvamount / 100.f : 1.f);
+        buildBlendMask(lab->L, blend, W, H, contrast, 1.f);
 #ifdef _OPENMP
         #pragma omp parallel for
 #endif