diff --git a/invesalius/data/slice_.py b/invesalius/data/slice_.py
index b5841ad..9db4490 100644
--- a/invesalius/data/slice_.py
+++ b/invesalius/data/slice_.py
@@ -341,6 +341,7 @@ class Slice(object):
         self.cross = cross
 
         self.window_level = vtk.vtkImageMapToWindowLevelColors()
+        self.window_level.SetInput(self.imagedata)
         #cast = vtk.vtkImageCast()
         #cast.SetInput(cross.GetOutput())
         #cast.GetOutput().SetUpdateExtentToWholeExtent()
@@ -396,15 +397,19 @@ class Slice(object):
     def UpdateWindowLevelBackground(self, pubsub_evt):
         window, level = pubsub_evt.data
         window_level = self.window_level
-        window_level.SetInput(self.imagedata)
-        window_level.SetWindow(window)
-        window_level.SetLevel(level)
-        window_level.SetOutputFormatToLuminance()
-        window_level.Update()
-
-        thresh_min, thresh_max = window_level.GetOutput().GetScalarRange()
-        self.lut_bg.SetTableRange(thresh_min, thresh_max)
-        self.img_colours_bg.SetInput(window_level.GetOutput())
+    
+        if not((window == window_level.GetWindow()) and\
+                (level == window_level.GetLevel())):
+                        
+            window_level.SetWindow(window)
+            window_level.SetLevel(level)
+            window_level.SetOutputFormatToLuminance()
+            window_level.Update()
+    
+            thresh_min, thresh_max = window_level.GetOutput().GetScalarRange()
+            self.lut_bg.SetTableRange(thresh_min, thresh_max)
+            self.img_colours_bg.SetInput(window_level.GetOutput())
+        
 
     def CreateMask(self, imagedata=None, name=None):
 
diff --git a/invesalius/data/viewer_slice.py b/invesalius/data/viewer_slice.py
index 18c67f5..d0918fb 100755
--- a/invesalius/data/viewer_slice.py
+++ b/invesalius/data/viewer_slice.py
@@ -33,6 +33,8 @@ import data.vtk_utils as vtku
 import project
 from slice_data import SliceData
 
+ID_TO_TOOL_ITEM = {}
+
 class Viewer(wx.Panel):
 
     def __init__(self, prnt, orientation='AXIAL'):
@@ -68,6 +70,7 @@ class Viewer(wx.Panel):
 
         self.__bind_events()
         self.__bind_events_wx()
+        self.__init_menus()
 
 
     def __init_gui(self):
@@ -85,13 +88,47 @@ class Viewer(wx.Panel):
         background_sizer.Add(scroll, 0, wx.EXPAND|wx.GROW)
         self.SetSizer(background_sizer)
         background_sizer.Fit(self)
-
+        
+        
         self.Layout()
         self.Update()
         self.SetAutoLayout(1)
 
         self.interactor = interactor
-
+        
+        
+    
+    def __init_menus(self):
+        
+        menu = self.menu = wx.Menu()
+        submenu_wl = wx.Menu()
+            
+        for name in sorted(const.WINDOW_LEVEL):
+            new_id = wx.NewId()
+            wl_item = wx.MenuItem(submenu_wl, new_id, name, kind=wx.ITEM_RADIO)
+            submenu_wl.AppendItem(wl_item)
+            ID_TO_TOOL_ITEM[new_id] = wl_item
+        
+        menu.AppendMenu(1, "Window Width & Level", submenu_wl)
+        self.Bind(wx.EVT_MENU, self.OnPopupWindowLevel)
+        self.Fit()
+        
+        
+        
+    def OnPopupWindowLevel(self, evt):
+        item = ID_TO_TOOL_ITEM[evt.GetId()]
+        key = item.GetLabel()
+        window, level = const.WINDOW_LEVEL[key]
+        
+        ps.Publisher().sendMessage('Bright and contrast adjustment image',
+                (window, level))    
+        ps.Publisher().sendMessage('Update slice viewer')    
+        evt.Skip()
+        
+    def OnContextMenu(self, evt):
+        self.PopupMenu(self.menu)
+        #evt.Skip()
+        
     def __config_interactor(self):
 
         ren = vtk.vtkRenderer()
@@ -101,6 +138,9 @@ class Viewer(wx.Panel):
 
         self.cam = ren.GetActiveCamera()
         self.ren = ren
+        
+
+        
 
     def append_mode(self, mode):
 
@@ -225,9 +265,8 @@ class Viewer(wx.Panel):
 
             ps.Publisher().sendMessage('Update window and level text',\
                                        "WL: %d  WW: %d"%(proj.level, proj.window))
-        self.interactor.Render()
-        #ps.Publisher().sendMessage("Update slice viewer")
-
+            self.interactor.Render()
+        
 
     def OnWindowLevelClick(self, evt, obj):
         proj = project.Project()
@@ -652,9 +691,23 @@ class Viewer(wx.Panel):
         print pubsub_evt.data
         self._brush_cursor_op = pubsub_evt.data
 
+
+    def popupID1(self, evt):
+        print "A"
+        print "...b..."
+        
+        evt.Skip()
+    
+    def popupID8(self, evt):
+        print "B"
+        evt.Skip()
+
     def __bind_events_wx(self):
         self.scroll.Bind(wx.EVT_SCROLL, self.OnScrollBar)
-        self.interactor.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
+        self.interactor.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)        
+        self.interactor.Bind(wx.EVT_RIGHT_DOWN, self.OnContextMenu)
+        
+
 
     def LoadImagedata(self, pubsub_evt):
         imagedata = pubsub_evt.data
@@ -903,7 +956,7 @@ class Viewer(wx.Panel):
 
     def UpdateRender(self, evt):
         self.interactor.Render()
-
+        
     def set_scroll_position(self, position):
         self.scroll.SetThumbPosition(position)
         self.OnScrollBar()
--
libgit2 0.21.2