diff --git a/src/gui/settings.py b/src/gui/settings.py
--- a/src/gui/settings.py
+++ b/src/gui/settings.py
@@ -1,5 +1,5 @@
 import tkinter as tk
-from tkinter import N,S,E,W
+from tkinter import N,S,E,W,LEFT
 
 from .util import MsgMixin
 
@@ -17,12 +17,13 @@ class Settings(tk.Toplevel,MsgMixin):
 		self.content.grid(column=0,row=0,sticky=(N,S,E,W))
 		self.content.columnconfigure(0,weight=1)
 		self._create()
+		self.parent.settings=self
+		self.parent.root.event_generate("<<setUp>>")
+		self.parent.sendMsg("fetchParams")
 
 	def _create(self):
 		self.scaleTresB=tk.Scale(self.content, orient=tk.HORIZONTAL, length=200, from_=0.0, to=100.0, command=self.refreshTresholds)
 		self.scaleTresW=tk.Scale(self.content, orient=tk.HORIZONTAL, length=200, from_=0.0, to=100.0, command=self.refreshTresholds)
-		self.scaleTresB.set(30.0) # !! proper defaults
-		self.scaleTresW.set(60.0)
 
 		blackLabel=tk.Label(self.content,text="Black stone treshold (intensity)")
 		whiteLabel=tk.Label(self.content,text="White stone treshold (intensity)")
@@ -31,5 +32,27 @@ class Settings(tk.Toplevel,MsgMixin):
 		whiteLabel.grid(column=0,row=2)
 		self.scaleTresW.grid(column=0,row=3,sticky=(E,W))
 
+		self.buttonFrame=tk.Frame(self.content)
+		self.buttonFrame.grid(column=0,row=4,sticky=(W,))
+		self.confirmButton=tk.Button(self.buttonFrame,text="OK",command=self.sendParams)
+		self.cancelButton=tk.Button(self.buttonFrame,text="Cancel",command=lambda: self.destroy())
+		self.confirmButton.pack(side=LEFT)
+		self.cancelButton.pack(side=LEFT)
+
 	def refreshTresholds(self,_):
-		self.parent.sendMsg("setTresholds",tuple(),{"tresB":self.scaleTresB.get(), "tresW":self.scaleTresW.get()})
+		self.parent.sendMsg("setTresholds",tuple(),self._compileParams())
+
+	def setParams(self,tresB=0,tresW=0):
+		self.scaleTresB.set(tresB)
+		self.scaleTresW.set(tresW)
+
+	def sendParams(self):
+		self.parent.sendMsg("setParams",tuple(),self._compileParams())
+		self.destroy()
+
+	def _compileParams(self):
+		params={
+			"tresB": self.scaleTresB.get(),
+			"tresW": self.scaleTresW.get()
+		}
+		return params