diff --git a/modules/photo/doc/cloning.rst b/modules/photo/doc/cloning.rst
index 48c5b24ba1..384c6b676a 100644
--- a/modules/photo/doc/cloning.rst
+++ b/modules/photo/doc/cloning.rst
@@ -39,7 +39,7 @@ colorChange
 -----------
 Given an original color image, two differently colored versions of this image can be mixed seamlessly.
 
-.. ocv:function:: void colorChange( InputArray src, InputArray mask, OutputArray dst, float red_mul = 1.0, float green_mul = 1.0, float blue_mul = 1.0)
+.. ocv:function:: void colorChange( InputArray src, InputArray mask, OutputArray dst, float red_mul = 1.0f, float green_mul = 1.0f, float blue_mul = 1.0f)
 
     :param src: Input 8-bit 3-channel image.
 
@@ -61,7 +61,7 @@ illuminationChange
 Applying an appropriate non-linear transformation to the gradient field inside the selection and then integrating back with a Poisson
 solver, modifies locally the apparent illumination of an image.
 
-.. ocv:function:: void illuminationChange(InputArray src, InputArray mask, OutputArray dst, float alpha = 0.2, float beta = 0.4)
+.. ocv:function:: void illuminationChange(InputArray src, InputArray mask, OutputArray dst, float alpha = 0.2f, float beta = 0.4f)
 
     :param src: Input 8-bit 3-channel image.
 
diff --git a/modules/photo/doc/npr.rst b/modules/photo/doc/npr.rst
index 48e2db2a7d..123c946c2a 100644
--- a/modules/photo/doc/npr.rst
+++ b/modules/photo/doc/npr.rst
@@ -8,7 +8,7 @@ edgePreservingFilter
 
 Filtering is the fundamental operation in image and video processing. Edge-preserving smoothing filters are used in many different applications.
 
-.. ocv:function:: void edgePreservingFilter(InputArray src, OutputArray dst, int flags = 1, float sigma_s = 60, float sigma_r = 0.4)
+.. ocv:function:: void edgePreservingFilter(InputArray src, OutputArray dst, int flags = 1, float sigma_s = 60, float sigma_r = 0.4f)
 
     :param src: Input 8-bit 3-channel image.
 
@@ -29,7 +29,7 @@ detailEnhance
 -------------
 This filter enhances the details of a particular image.
 
-.. ocv:function:: void detailEnhance(InputArray src, OutputArray dst, float sigma_s = 10, float sigma_r = 0.15)
+.. ocv:function:: void detailEnhance(InputArray src, OutputArray dst, float sigma_s = 10, float sigma_r = 0.15f)
 
     :param src: Input 8-bit 3-channel image.
 
@@ -44,7 +44,7 @@ pencilSketch
 ------------
 Pencil-like non-photorealistic line drawing
 
-.. ocv:function:: void pencilSketch(InputArray src, OutputArray dst1, OutputArray dst2, float sigma_s = 60, float sigma_r = 0.07, float shade_factor = 0.02)
+.. ocv:function:: void pencilSketch(InputArray src, OutputArray dst1, OutputArray dst2, float sigma_s = 60, float sigma_r = 0.07f, float shade_factor = 0.02f)
 
     :param src: Input 8-bit 3-channel image.
 
@@ -63,7 +63,7 @@ stylization
 -----------
 Stylization aims to produce digital imagery with a wide variety of effects not focused on photorealism. Edge-aware filters are ideal for stylization, as they can abstract regions of low contrast while preserving, or enhancing, high-contrast features.
 
-.. ocv:function:: void stylization(InputArray src, OutputArray dst, float sigma_s = 60, float sigma_r = 0.45)
+.. ocv:function:: void stylization(InputArray src, OutputArray dst, float sigma_s = 60, float sigma_r = 0.45f)
 
     :param src: Input 8-bit 3-channel image.
 
diff --git a/modules/photo/include/opencv2/photo.hpp b/modules/photo/include/opencv2/photo.hpp
index 7ca933c3f6..f0e3f8ec8a 100644
--- a/modules/photo/include/opencv2/photo.hpp
+++ b/modules/photo/include/opencv2/photo.hpp
@@ -306,27 +306,27 @@ CV_EXPORTS_W void decolor( InputArray src, OutputArray grayscale, OutputArray co
 CV_EXPORTS_W void seamlessClone( InputArray src, InputArray dst, InputArray mask, Point p,
         OutputArray blend, int flags);
 
-CV_EXPORTS_W void colorChange(InputArray src, InputArray mask, OutputArray dst, float red_mul = 1.0,
-        float green_mul = 1.0, float blue_mul = 1.0);
+CV_EXPORTS_W void colorChange(InputArray src, InputArray mask, OutputArray dst, float red_mul = 1.0f,
+        float green_mul = 1.0f, float blue_mul = 1.0f);
 
 CV_EXPORTS_W void illuminationChange(InputArray src, InputArray mask, OutputArray dst,
-        float alpha = 0.2, float beta = 0.4);
+        float alpha = 0.2f, float beta = 0.4f);
 
 CV_EXPORTS_W void textureFlattening(InputArray src, InputArray mask, OutputArray dst,
         double low_threshold = 30, double high_threshold = 45,
         int kernel_size = 3);
 
 CV_EXPORTS_W void edgePreservingFilter(InputArray src, OutputArray dst, int flags = 1,
-        float sigma_s = 60, float sigma_r = 0.4);
+        float sigma_s = 60, float sigma_r = 0.4f);
 
 CV_EXPORTS_W void detailEnhance(InputArray src, OutputArray dst, float sigma_s = 10,
-        float sigma_r = 0.15);
+        float sigma_r = 0.15f);
 
 CV_EXPORTS_W void pencilSketch(InputArray src, OutputArray dst1, OutputArray dst2,
-        float sigma_s = 60, float sigma_r = 0.07, float shade_factor = 0.02);
+        float sigma_s = 60, float sigma_r = 0.07f, float shade_factor = 0.02f);
 
 CV_EXPORTS_W void stylization(InputArray src, OutputArray dst, float sigma_s = 60,
-        float sigma_r = 0.45);
+        float sigma_r = 0.45f);
 
 } // cv
 
diff --git a/modules/photo/src/contrast_preserve.cpp b/modules/photo/src/contrast_preserve.cpp
index 7794b3646d..806afdf312 100644
--- a/modules/photo/src/contrast_preserve.cpp
+++ b/modules/photo/src/contrast_preserve.cpp
@@ -98,7 +98,7 @@ void cv::decolor(InputArray _src, OutputArray _dst, OutputArray _color_boost)
     obj.weak_order(img,alf);
 
     // Solver
-    Mat Mt = Mat(polyGrad.size(),polyGrad[0].size(), CV_32FC1);
+    Mat Mt = Mat((int)polyGrad.size(),(int)polyGrad[0].size(), CV_32FC1);
     obj.wei_update_matrix(polyGrad,Cg,Mt);
 
     vector <double> wei;
diff --git a/modules/photo/src/contrast_preserve.hpp b/modules/photo/src/contrast_preserve.hpp
index 8a95170e32..f57dc14d32 100644
--- a/modules/photo/src/contrast_preserve.hpp
+++ b/modules/photo/src/contrast_preserve.hpp
@@ -117,7 +117,7 @@ void Decolor::init()
     kernely.at<float>(0,0)=1.0;
     kernely.at<float>(1,0)=-1.0;
     order = 2;
-    sigma = .02;
+    sigma = 0.02f;
 }
 
 vector<double> Decolor::product(vector < vector<int> > &comb, vector <double> &initRGB)
@@ -343,18 +343,19 @@ void Decolor::grad_system(Mat img, vector < vector < double > > &polyGrad,
 
 void Decolor::wei_update_matrix(vector < vector <double> > &poly, vector <double> &Cg, Mat &X)
 {
-    Mat P = Mat(poly.size(),poly[0].size(), CV_32FC1);
-    Mat A = Mat(poly.size(),poly.size(), CV_32FC1);
+    int size = static_cast<int>(poly.size()), size0 = static_cast<int>(poly[0].size());
+    Mat P = Mat(size, size0, CV_32FC1);
+    Mat A = Mat(size, size, CV_32FC1);
 
-    for(unsigned int i =0;i<poly.size();i++)
-        for(unsigned int j=0;j<poly[0].size();j++)
+    for (int i = 0; i < size; i++)
+        for (int j = 0; j < size0;j++)
             P.at<float>(i,j) = (float) poly[i][j];
 
     Mat P_trans = P.t();
-    Mat B = Mat(poly.size(),poly[0].size(), CV_32FC1);
-    for(unsigned int i =0;i < poly.size();i++)
+    Mat B = Mat(size, size0, CV_32FC1);
+    for(int i =0;i < size;i++)
     {
-        for(unsigned int j=0;j<Cg.size();j++)
+        for(int j = 0, end = Cg.size(); j < end;j++)
             B.at<float>(i,j) = (float) (poly[i][j] * Cg[j]);
     }
 
@@ -414,8 +415,8 @@ void Decolor::grayImContruct(vector <double> &wei, Mat img, Mat &Gray)
                     kk=kk+1;
                 }
 
-    float minval = INT_MAX;
-    float maxval = INT_MIN;
+    float minval = FLT_MAX;
+    float maxval = -FLT_MAX;
 
     for(int i=0;i<h;i++)
         for(int j =0;j<w;j++)
diff --git a/modules/photo/src/npr.cpp b/modules/photo/src/npr.cpp
index 3f0be9ba9f..761f3c73cb 100644
--- a/modules/photo/src/npr.cpp
+++ b/modules/photo/src/npr.cpp
@@ -79,7 +79,7 @@ void cv::detailEnhance(InputArray _src, OutputArray _dst, float sigma_s, float s
 
     int h = I.size().height;
     int w = I.size().width;
-    float factor = 3.0;
+    float factor = 3.0f;
 
     Mat img = Mat(I.size(),CV_32FC3);
     I.convertTo(img,CV_32FC3,1.0/255.0);
diff --git a/modules/photo/test/test_cloning.cpp b/modules/photo/test/test_cloning.cpp
index 761b6e0d70..62fe243954 100644
--- a/modules/photo/test/test_cloning.cpp
+++ b/modules/photo/test/test_cloning.cpp
@@ -155,7 +155,7 @@ TEST(Photo_SeamlessClone_illuminationChange, regression)
     ASSERT_FALSE(mask.empty()) << "Could not load mask image " << original_path2;
 
     Mat result;
-    illuminationChange(source, mask, result, .2, .4);
+    illuminationChange(source, mask, result, 0.2f, 0.4f);
 
     imwrite(folder + "cloned.png", result);
 
diff --git a/modules/photo/test/test_npr.cpp b/modules/photo/test/test_npr.cpp
index 993f6c390f..4d1c027ba1 100755
--- a/modules/photo/test/test_npr.cpp
+++ b/modules/photo/test/test_npr.cpp
@@ -106,7 +106,7 @@ TEST(Photo_NPR_PencilSketch, regression)
     ASSERT_FALSE(source.empty()) << "Could not load input image " << original_path;
 
     Mat result,result1;
-    pencilSketch(source,result,result1,10,.1,.03);
+    pencilSketch(source,result,result1, 10, 0.1f, 0.03f);
 
     imwrite(folder + "pencil_sketch.png", result);
     imwrite(folder + "color_pencil_sketch.png", result1);
diff --git a/samples/cpp/cloning_demo.cpp b/samples/cpp/cloning_demo.cpp
index 65a57f1497..24d9b7facf 100644
--- a/samples/cpp/cloning_demo.cpp
+++ b/samples/cpp/cloning_demo.cpp
@@ -210,7 +210,7 @@ int main()
 
         Mat result;
 
-        illuminationChange(source, mask, result, .2, .4);
+        illuminationChange(source, mask, result, 0.2f, 0.4f);
 
         imshow("Output",result);
         imwrite(folder + "cloned.png", result);
diff --git a/samples/cpp/npr_demo.cpp b/samples/cpp/npr_demo.cpp
index 30d30cba9f..5579ca269f 100644
--- a/samples/cpp/npr_demo.cpp
+++ b/samples/cpp/npr_demo.cpp
@@ -83,7 +83,7 @@ int main(int argc, char* argv[])
     else if(num == 3)
     {
         Mat img1;
-        pencilSketch(I,img1, img, 10 ,.1,.03);
+        pencilSketch(I,img1, img, 10 , 0.1f, 0.03f);
         imshow("Pencil Sketch",img1);
         imshow("Color Pencil Sketch",img);
     }