diff --git a/ogl.cpp b/ogl.cpp
index 67b4e82..0eafb41 100644
--- a/ogl.cpp
+++ b/ogl.cpp
@@ -69,11 +69,13 @@ namespace ogl
     glTexImage1D(GL_TEXTURE_1D, 0, GL_RGB, tex.width, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
     glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 
     png_close_file(&tex);
     delete data;
   }
-  
+
   void initialize(PheromoneMap * phero_map) {
     glEnable(GL_TEXTURE_1D);
     glEnable(GL_TEXTURE_2D);
diff --git a/pheromone.cpp b/pheromone.cpp
index cd26dbb..893cad3 100644
--- a/pheromone.cpp
+++ b/pheromone.cpp
@@ -36,7 +36,7 @@
 #define MAP_POS(X, Y) (data[((X) * m_height) + (Y)])
 
 static const unsigned int  MAX_ITERS           = 1000;
-static const float         EVAPORATION_RATE    = 0.1f;
+static const float         EVAPORATION_RATE    = 0.05f;
 const        unsigned char MAX_PHERO_INTENSITY = 250;
 const        unsigned char MIN_PHERO_INTENSITY = 0;
 
diff --git a/shaders/color_map.png b/shaders/color_map.png
index 98f2d2b..94d3a2f 100644
Binary files a/shaders/color_map.png and b/shaders/color_map.png differ