diff --git a/invesalius/data/slice_.py b/invesalius/data/slice_.py
index e9ddb40..64dc014 100644
--- a/invesalius/data/slice_.py
+++ b/invesalius/data/slice_.py
@@ -55,9 +55,9 @@ class Slice(object):
 
         ps.Publisher().subscribe(self.UpdateWindowLevelBackground,\
                                  'Bright and contrast adjustment image')
-        
-        ps.Publisher().subscribe(self.UpdateColorTableBackground,\
-                                 'Change color table from background image')
+
+        ps.Publisher().subscribe(self.UpdateColourTableBackground,\
+                                 'Change colour table from background image')
 
     def __set_current_mask_threshold_limits(self, pubsub_evt):
         thresh_min = pubsub_evt.data[0]
@@ -404,30 +404,30 @@ class Slice(object):
 
         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 UpdateColorTableBackground(self, pubsub_evt):
+
+    def UpdateColourTableBackground(self, pubsub_evt):
         values = pubsub_evt.data
-        
+
         if (values[0]):
             self.lut_bg.SetNumberOfColors(values[0])
-        
+
         self.lut_bg.SetSaturationRange(values[1])
         self.lut_bg.SetHueRange(values[2])
         self.lut_bg.SetValueRange(values[3])
-        
+
         thresh_min, thresh_max = self.window_level.GetOutput().GetScalarRange()
         self.lut_bg.SetTableRange(thresh_min, thresh_max)
-        
-        
+
+
     def CreateMask(self, imagedata=None, name=None):
 
         future_mask = Mask()
diff --git a/invesalius/gui/widgets/slice_menu.py b/invesalius/gui/widgets/slice_menu.py
index 8453501..5a5cfa8 100644
--- a/invesalius/gui/widgets/slice_menu.py
+++ b/invesalius/gui/widgets/slice_menu.py
@@ -99,7 +99,7 @@ class SliceMenu(wx.Menu):
 
         elif(key in const.SLICE_COLOR_TABLE.keys()):
             values = const.SLICE_COLOR_TABLE[key]
-            ps.Publisher().sendMessage('Change color table from background image', values)
+            ps.Publisher().sendMessage('Change colour table from background image', values)
             ps.Publisher().sendMessage('Update slice viewer')
 
         elif(key in const.IMAGE_TILING.keys()):
--
libgit2 0.21.2