diff --git a/src/core.py b/src/core.py
--- a/src/core.py
+++ b/src/core.py
@@ -19,12 +19,15 @@ class Core:
 		self._ownMessages=MsgQueue(self._handleEvent)
 		self._guiMessages=MsgQueue()
 
-		imgPath=os.path.join(os.path.dirname(__file__), "..","images",cfg.misc.defaultImage)
+		self._imgDir=os.path.join(os.path.dirname(__file__), "..","images")
+		self._imgs=sorted(os.listdir(self._imgDir))
+		self._imgIndex=cfg.misc.defaultImage
+		imgPath=os.path.join(self._imgDir,self._imgs[self._imgIndex])
 		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.copy(),))
+		self.relativeFrame(0)
 
 	def setCorners(self,corners):
 		self.detector.setGridCorners(corners)
@@ -37,6 +40,12 @@ class Core:
 		if self.detector.analyze(self._frame):
 			self._guiMessages.send("setGameState",(self.detector.board,))
 
+	def relativeFrame(self,step):
+		self._imgIndex=(self._imgIndex+step)%len(self._imgs)
+		imgPath=os.path.join(self._imgDir,self._imgs[self._imgIndex])
+		self._frame=PIL.Image.open(imgPath)
+		self._guiMessages.send("setCurrentFrame",(self._frame.copy(),))
+
 	def listen(self):
 		listenerThread=threading.Thread(target=lambda: self._ownMessages.listen())
 		listenerThread.start()
@@ -46,7 +55,12 @@ class Core:
 		self._ownMessages.send("!kill")
 
 	def _handleEvent(self,e):
-		actions={"setCorners":self.setCorners, "setTresholds":self.setTresholds}
+		actions={
+			"setCorners": self.setCorners,
+			"setTresholds": self.setTresholds,
+			"prevFrame": lambda: self.relativeFrame(-1),
+			"nextFrame": lambda: self.relativeFrame(1)
+		}
 		(actionName,args,kwargs)=e
 
 		return actions[actionName](*args,**kwargs)