diff --git a/src/core.py b/src/core.py
--- a/src/core.py
+++ b/src/core.py
@@ -20,12 +20,12 @@ class Core:
 		self._ownMessages=MsgQueue(self._handleEvent)
 		self._guiMessages=MsgQueue()
 
-		imgPath=os.path.join(os.path.dirname(__file__), "..","images","7.jpg")
+		imgPath=os.path.join(os.path.dirname(__file__), "..","images","5.jpg")
 		self._frame=PIL.Image.open(imgPath)
 
 		self._guiProc=multiprocessing.Process(name="gui", target=gui, args=(self._guiMessages,self._ownMessages))
 		self._guiProc.start()
-		self._guiMessages.send("setCurrentFrame",(self._frame,))
+		self._guiMessages.send("setCurrentFrame",(self._frame.copy(),))
 
 	def setCorners(self,corners):
 		self.detector.setGridCorners(corners)
@@ -44,7 +44,7 @@ class Core:
 
 	def joinGui(self):
 		self._guiProc.join()
-		self._ownMessages.send("kill")
+		self._ownMessages.send("!kill")
 
 	def _handleEvent(self,e):
 		actions={"setCorners":self.setCorners, "setTresholds":self.setTresholds}