diff --git a/src/quadtree.cpp b/src/quadtree.cpp
index dc0ed97..ae00da1 100644
--- a/src/quadtree.cpp
+++ b/src/quadtree.cpp
@@ -31,7 +31,7 @@ SDL_Surface * QuadTree::image(short niveau_p) {
         SDL_Surface * couleur_unie = SDL_CreateRGBSurface(0, dimensions.first, dimensions.second, 32, r_mask, g_mask, b_mask, a_mask);
         if(SDL_LockSurface(couleur_unie) == 0) {
             SDL_memset(couleur_unie->pixels, static_cast<int>(
-                SDL_MapRGB(couleur_unie->format, couleur.r, couleur.g, couleur.b)
+                SDL_MapRGBA(couleur_unie->format, couleur.r, couleur.g, couleur.b, 255)
             ), static_cast<size_t>(couleur_unie->h * couleur_unie->pitch));
 
             SDL_UnlockSurface(couleur_unie);
@@ -51,30 +51,31 @@ SDL_Surface * QuadTree::image(short niveau_p) {
 }
 
 SDL_Color QuadTree::calculeCouleur(SDL_Surface * s) {
-    int r = 0, g = 0, b = 0;
+    int r = 0, g = 0, b = 0, a = 0;
     if(SDL_LockSurface(s) == 0) {
         for(int x = 0; x < s->w; ++x) {
             for(int y = 0; y < s->h; ++y) {
-                Uint8 r_temp, g_temp, b_temp;
-                SDL_GetRGB(*reinterpret_cast<Uint32 *>(
+                Uint8 r_temp, g_temp, b_temp, a_temp;
+                SDL_GetRGBA(*reinterpret_cast<Uint32 *>(
                     static_cast<Uint8 *>(s->pixels) + y * s->pitch + x * s->format->BytesPerPixel
-                ), s->format, &r_temp, &g_temp, &b_temp);
+                ), s->format, &r_temp, &g_temp, &b_temp, &a_temp);
                 r += r_temp;
                 g += g_temp;
                 b += b_temp;
+                a += a_temp;
             }
         }
 
         SDL_UnlockSurface(s);
     }
 
-    SDL_Color color;
     int diviseur = s->w * s->h;
-    color.r = floor(r / diviseur);
-    color.g = floor(g / diviseur);
-    color.b = floor(b / diviseur);
-
-    return color;
+    return SDL_Color{
+       static_cast<Uint8>(r / diviseur),
+       static_cast<Uint8>(g / diviseur),
+       static_cast<Uint8>(b / diviseur),
+       static_cast<Uint8>(a / diviseur),
+    };
 }
 
 bool QuadTree::verificationEgalitee(SDL_Surface * s) {