diff --git a/img/backgrounds/sky.jpg b/img/backgrounds/sky.jpg
new file mode 100644
index 0000000..6272390
Binary files /dev/null and b/img/backgrounds/sky.jpg differ
diff --git a/opengl-test-two/main.cpp b/opengl-test-two/main.cpp
index f97fb56..b2911a2 100644
--- a/opengl-test-two/main.cpp
+++ b/opengl-test-two/main.cpp
@@ -10,7 +10,7 @@
 
 int main(int argc, char* args[]) {
     GLFWwindow* window;
-    GLuint tex1, tex2;
+    GLuint texFG, texBG;
     int textw, texth;
     int textw2, texth2;
 
@@ -92,20 +92,19 @@ int main(int argc, char* args[]) {
 
 
 
-    tex1 = LoadTexture("../img/tests/flieger.jpg",&textw,&texth);
-    printf("Tex1: %d\n", tex1);
+    texBG = LoadTexture("../img/backgrounds/sky.jpg",&textw2,&texth2);
+    texFG = LoadTexture("../img/tests/flieger.jpg",&textw,&texth);
+    printf("Tex1: %d\n", texFG);
     glfwSetWindowSize(window, textw, texth);
     glViewport(0, 0, textw, texth);
     glfwSetWindowSizeLimits(window, textw, texth, textw, texth);
 
-    // The texture we'<re going to render to
+    // The texture we're going to render to
     GLuint renderedTexture;
     glGenTextures(1, &renderedTexture);
-    // "Bind" the newly created texture : all future texture functions will modify this texture
     glBindTexture(GL_TEXTURE_2D, renderedTexture);
-    // Give an empty image to OpenGL ( the last "0" )
+
     glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, textw, texth, 0,GL_RGB, GL_UNSIGNED_BYTE, 0);
-    // Poor filtering. Needed !
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 
@@ -129,9 +128,12 @@ int main(int argc, char* args[]) {
 
     GLint textureLocTri = glGetUniformLocation(programRefineID, "trimap");
     GLint textureLocFore = glGetUniformLocation(programRefineID, "foreground");
+    GLint textureLocBack = glGetUniformLocation(programRefineID, "background");
 
     glActiveTexture(GL_TEXTURE0);
-    glBindTexture(GL_TEXTURE_2D, tex1);
+    glBindTexture(GL_TEXTURE_2D, texFG);
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(GL_TEXTURE_2D, texBG);
     glActiveTexture(GL_TEXTURE2);
     glBindTexture(GL_TEXTURE_2D, renderedTexture);
 
@@ -199,6 +201,7 @@ int main(int argc, char* args[]) {
 
         glUseProgram(programRefineID);
         glUniform1i(textureLocTri, 2);
+        glUniform1i(textureLocBack, 1);
         glUniform1i(textureLocFore, 0);
 
 
diff --git a/opengl-test-two/opengl-test-two.depend b/opengl-test-two/opengl-test-two.depend
index 1a80ac8..9e3caa7 100644
--- a/opengl-test-two/opengl-test-two.depend
+++ b/opengl-test-two/opengl-test-two.depend
@@ -2,16 +2,13 @@
 1385320478 source:d:\owncloud\documents\programmierung\cpp\opengl-test-two\main.cpp
 	<iostream>
 
-1473145022 source:d:\owncloud\documents\programmierung\cpp\imanox-chroma-matting\opengl-test-two\main.cpp
+1473703631 source:d:\owncloud\documents\programmierung\cpp\imanox-chroma-matting\opengl-test-two\main.cpp
 	<GL/glew.h>
 	<GLFW/glfw3.h>
 	<SDL2/SDL.h>
-	<SDL2/SDL_image.h>
-	<stdio.h>
-	<iostream>
 	<fstream>
-	<vector>
 	<stdexcept>
+	"loaders.h"
 
 1473015242 d:\owncloud\documents\programmierung\cpp\imanox-chroma-matting\opengl-test-two\include\glfw\glfw3.h
 	<stddef.h>
diff --git a/opengl-test-two/refinement.fragmentshader b/opengl-test-two/refinement.fragmentshader
index cd10ef8..09a7857 100644
--- a/opengl-test-two/refinement.fragmentshader
+++ b/opengl-test-two/refinement.fragmentshader
@@ -9,6 +9,7 @@ out vec3 color;
 // Values that stay constant for the whole mesh.
 uniform sampler2D trimap;
 uniform sampler2D foreground;
+uniform sampler2D background;
 
 
 int IS_BACKGROUND = 0;
@@ -24,6 +25,10 @@ vec3 getForeColor(vec2 uvCoord) {
     return texture(foreground, uvCoord).rgb;
 }
 
+vec3 getBackColor(vec2 uvCoord) {
+    return texture(background, uvCoord).rgb;
+}
+
 int getState(vec3 c) {
     if (all(lessThanEqual(c, vec3(0.2f)))) {
         return IS_BACKGROUND;
@@ -42,5 +47,9 @@ void main(){
 
     if (status==IS_FOREGROUND) {
         color = getForeColor(UV).rgb;
+    } else if (status==IS_BACKGROUND) {
+        color = getBackColor(UV).rgb;
+    } else {
+        // render undefined area
     }
 }
diff --git a/opengl-test-two/trimap.fragmentshader b/opengl-test-two/trimap.fragmentshader
index 0e5c5d3..75da72f 100644
--- a/opengl-test-two/trimap.fragmentshader
+++ b/opengl-test-two/trimap.fragmentshader
@@ -21,6 +21,10 @@ int IS_UNDEFINED = 1;
 int IS_FOREGROUND = 2;
 int UNSET = -1;
 
+vec3 greenValue = vec3(0.0f, 1.0f, 0.0f);
+vec3 difference = vec3(40.0f/255.0f);
+int radius = 10;
+
 
 vec3 getColor(vec2 uvCoord) {
     return texture(myTextureSampler, uvCoord).rgb;
@@ -31,8 +35,8 @@ bool isBackground(vec3 c) {
     if (all(   lessThanEqual(c, vec3(51.0f/255.0f, 208.0f/255.0f, 13.0f/255.0f))) &&
         all(greaterThanEqual(c, vec3(47.0f/255.0f, 204.0f/255.0f, 9.0f/255.0f)))*/
     // 0, 255, 0
-    if (all(   lessThanEqual(c, vec3(2.0f/255.0f, 255.0f/255.0f, 2.0f/255.0f))) &&
-        all(greaterThanEqual(c, vec3(0.0f/255.0f, 253.0f/255.0f, 0.0f/255.0f)))
+    if (all(   lessThanEqual(c, greenValue+difference)) &&
+        all(greaterThanEqual(c, greenValue-difference))
         ) {
         return true;
     } else {
@@ -43,9 +47,9 @@ bool isBackground(vec3 c) {
 void main(){
     int status = UNSET;
 
-    for(int w=-5;w<=5;w++){
-        for(int h=-5;h<=5;h++){
-            if (w+h==-10) { // first pixel
+    for(int w=-radius;w<=radius;w++){
+        for(int h=-radius;h<=radius;h++){
+            if (w+h==-radius*2) { // first pixel
                 if (isBackground(getColor(UV+vec2(pixWidth*w, pixHeight*h)))) {
                     status = IS_BACKGROUND;
                 } else {