diff --git a/src/seam-carving.cpp b/src/seam-carving.cpp
index a8605fa..8d8ace2 100644
--- a/src/seam-carving.cpp
+++ b/src/seam-carving.cpp
@@ -113,8 +113,27 @@ std::string function = "grad";
                            (fabs((float)source[indexPixel_right + ch] -        \
                                  source[indexPixel + ch]))));                  \
     }                                                                          \
+  } else if (function == "sumexpgradcomp") {                                   \
+                                                                               \
+    for (auto ch = 0; ch < (nbColorChannels); ch++) {                          \
+      dest += (std::exp(fabs((float)source[indexPixel_up + ch] -               \
+                             source[indexPixel + ch]) /                        \
+                        255) +                                                 \
+                                                                               \
+               std::exp(fabs((float)source[indexPixel_down + ch] -             \
+                             source[indexPixel + ch]) /                        \
+                        255) +                                                 \
+                                                                               \
+               std::exp(fabs((float)source[indexPixel_left + ch] -             \
+                             source[indexPixel + ch]) /                        \
+                        255) +                                                 \
+               std::exp(fabs((float)source[indexPixel_right + ch] -            \
+                             source[indexPixel + ch]) /                        \
+                        255));                                                 \
+    }                                                                          \
   } else {                                                                     \
-    std::cerr << "function " << function << " not available" << std::endl;     \
+    std::cerr << "no implementation found for function \"" << function << "\"" \
+              << std::endl;                                                    \
     exit(1);                                                                   \
   };
 // Le alpha n'est pas pris en compte dans l'énergie