diff --git a/eh18-image.py b/eh18-image.py
index 2b81365..f311bdb 100644
--- a/eh18-image.py
+++ b/eh18-image.py
@@ -33,8 +33,23 @@ def randomnumber(pseed,pmin,pmax,v1,v2,v3):
 newseed=(int)(time.time()/60)
 seed=newseed
 
+parts=4 #n users
+user=1 #1..n
+
 if __name__ == '__main__':
 
+    pixelcoords=[]
+    for _x in range(width):
+        for _y in range(height):
+            pixelcoords+=[(_x,_y)]
+
+    random.seed(42)
+    random.shuffle(pixelcoords)
+    print(pixelcoords)
+
+
+    pixelcoords=pixelcoords[int(len(pixelcoords)/parts)*(user-1):int(len(pixelcoords)/parts)*(user)]
+
     while True:
         starttime=time.time()
         commandsarray=[]
@@ -50,12 +65,7 @@ if __name__ == '__main__':
         print("xv="+str(xv)+ "yv="+str(yv))
         _current_command=""
 
-        pixelcoords=[]
-        for _x in range(width):
-            for _y in range(height):
-                pixelcoords+=[(_x,_y)]
 
-        shuffle(pixelcoords)