diff --git a/rtdata/profiles/Pixel Shift/PS ISO Low.pp3 b/rtdata/profiles/Pixel Shift/PS ISO Low.pp3
index afd3b762c..5587b19e0 100644
--- a/rtdata/profiles/Pixel Shift/PS ISO Low.pp3	
+++ b/rtdata/profiles/Pixel Shift/PS ISO Low.pp3	
@@ -12,7 +12,7 @@ Enabled=true
 Contrast=15
 Matrix=false
 Strength=20
-Uniformity=50
+Uniformity=5
 
 [RAW]
 CA=true
diff --git a/rtdata/profiles/Pixel Shift/PS No Motion.pp3 b/rtdata/profiles/Pixel Shift/PS No Motion.pp3
index af624912e..f1d889f97 100644
--- a/rtdata/profiles/Pixel Shift/PS No Motion.pp3	
+++ b/rtdata/profiles/Pixel Shift/PS No Motion.pp3	
@@ -12,7 +12,7 @@ Enabled=true
 Contrast=15
 Matrix=false
 Strength=20
-Uniformity=50
+Uniformity=5
 
 [RAW]
 CA=true
diff --git a/rtengine/ipsharpen.cc b/rtengine/ipsharpen.cc
index 8437fae47..84068ced9 100644
--- a/rtengine/ipsharpen.cc
+++ b/rtengine/ipsharpen.cc
@@ -643,7 +643,7 @@ BENCHFUN
     const int k = params->sharpenMicro.matrix ? 1 : 2;
     // k=2 matrix 5x5  k=1 matrix 3x3
     const int width = W, height = H;
-    const int unif = params->sharpenMicro.uniformity / 10.0f; //put unif between 0 to 10
+    const int unif = params->sharpenMicro.uniformity;
     const float amount = (k == 1 ? 2.7f : 1.f) * params->sharpenMicro.amount / 1500.0f; //amount 2000.0 quasi no artifacts ==> 1500 = maximum, after artifacts, 25/9 if 3x3
 
     if (settings->verbose) {
diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index 5c4596745..fe4512691 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -1149,7 +1149,7 @@ SharpenMicroParams::SharpenMicroParams() :
     matrix(false),
     amount(20.0),
     contrast(20.0),
-    uniformity(50.0)
+    uniformity(5)
 {
 }
 
@@ -3962,7 +3962,13 @@ int ProcParams::load(const Glib::ustring& fname, ParamsEdited* pedited)
                     pedited->sharpenMicro.contrast = true;
                 }
             }
-            assignFromKeyfile(keyFile, "SharpenMicro", "Uniformity", pedited, sharpenMicro.uniformity, pedited->sharpenMicro.uniformity);
+            if (ppVersion >= 346) {
+                assignFromKeyfile(keyFile, "SharpenMicro", "Uniformity", pedited, sharpenMicro.uniformity, pedited->sharpenMicro.uniformity);
+            } else {
+                double temp;
+                assignFromKeyfile(keyFile, "SharpenMicro", "Uniformity", pedited, temp, pedited->sharpenMicro.uniformity);
+                sharpenMicro.uniformity = temp / 10;
+            }
         }
 
         if (keyFile.has_group("Vibrance")) {
diff --git a/rtengine/procparams.h b/rtengine/procparams.h
index d1b70b9c2..50e77d32e 100644
--- a/rtengine/procparams.h
+++ b/rtengine/procparams.h
@@ -531,7 +531,7 @@ struct SharpenMicroParams {
     bool    matrix;
     double  amount;
     double  contrast;
-    double  uniformity;
+    int     uniformity;
 
     SharpenMicroParams();
 
diff --git a/rtgui/ppversion.h b/rtgui/ppversion.h
index 91a9633c0..89f93ed44 100644
--- a/rtgui/ppversion.h
+++ b/rtgui/ppversion.h
@@ -1,11 +1,13 @@
 #pragma once
 
 // This number has to be incremented whenever the PP3 file format is modified or the behaviour of a tool changes
-#define PPVERSION 345
+#define PPVERSION 346
 #define PPVERSION_AEXP 301 //value of PPVERSION when auto exposure algorithm was modified
 
 /*
   Log of version changes
+   346  2019-01-01
+        changed microcontrast uniformity
    345  2018-10-21
         dual demosaic auto contrast threshold
    344  2018-10-04
diff --git a/rtgui/sharpenmicro.cc b/rtgui/sharpenmicro.cc
index 7e981db96..8686b747b 100644
--- a/rtgui/sharpenmicro.cc
+++ b/rtgui/sharpenmicro.cc
@@ -40,7 +40,7 @@ SharpenMicro::SharpenMicro () : FoldableToolPanel(this, "sharpenmicro", M("TP_SH
     amount->setAdjusterListener (this);
     amount->show();
 
-    uniformity = Gtk::manage(new Adjuster (M("TP_SHARPENMICRO_UNIFORMITY"), 0, 100, 10, 50));
+    uniformity = Gtk::manage(new Adjuster (M("TP_SHARPENMICRO_UNIFORMITY"), 0, 10, 1, 5));
     uniformity->setAdjusterListener (this);
     uniformity->show();