trying to fix python wrapper warning on win64

modules/bioinspired/include/opencv2/bioinspired/retina.hpp

@@ -398,7 +398,7 @@ public:
     @param colorSaturationValue the saturation factor : a simple factor applied on the chrominance
     buffers
      */
-    CV_WRAP virtual void setColorSaturation(const bool saturateColors=true, const float colorSaturationValue=4.0)=0;
+    CV_WRAP virtual void setColorSaturation(const bool saturateColors=true, const float colorSaturationValue=4.0f)=0;
 
     /** @brief Clears all retina buffers
 

modules/bioinspired/src/retina.cpp

@@ -241,7 +241,7 @@ public:
      * @param saturateColors: boolean that activates color saturation (if true) or desactivate (if false)
      * @param colorSaturationValue: the saturation factor
      */
-    void setColorSaturation(const bool saturateColors=true, const float colorSaturationValue=4.0);
+    void setColorSaturation(const bool saturateColors=true, const float colorSaturationValue=4.0f);
 
     /**
      * clear all retina buffers (equivalent to opening the eyes after a long period of eye close ;o)