diff --git a/invesalius/data/slice_.py b/invesalius/data/slice_.py
index f476e57..5d03701 100644
--- a/invesalius/data/slice_.py
+++ b/invesalius/data/slice_.py
@@ -81,7 +81,8 @@ class Slice(object):
         self.imagedata = None
         self.current_mask = None
         self.blend_filter = None
-        self.matrix = None
+        self.histogram = None
+        self._matrix = None
         self.spacing = (1.0, 1.0, 1.0)
 
         self.number_of_colours = 256
@@ -99,6 +100,17 @@ class Slice(object):
         self.from_ = OTHER
         self.__bind_events()
 
+    @property
+    def matrix(self):
+        return self._matrix
+
+    @matrix.setter
+    def matrix(self, value):
+        self._matrix = value
+        i, e = value.min(), value.max()
+        r = e - i
+        self.histogram = numpy.histogram(self._matrix, r, (i, e))[0]
+
     def __bind_events(self):
         # General slice control
         Publisher.subscribe(self.CreateSurfaceFromIndex,
diff --git a/invesalius/gui/dialogs.py b/invesalius/gui/dialogs.py
index c970dea..60ab07e 100644
--- a/invesalius/gui/dialogs.py
+++ b/invesalius/gui/dialogs.py
@@ -1278,21 +1278,26 @@ class SurfaceMethodPanel(wx.Panel):
 
 
 class ClutImagedataDialog(wx.Dialog):
-    def __init__(self):
+    def __init__(self, histogram, init, end, wl, ww):
         pre = wx.PreDialog()
         pre.Create(None, -1, style=wx.DEFAULT_DIALOG_STYLE)
         self.PostCreate(pre)
 
+        self.histogram = histogram
+        self.init = init
+        self.end = end
+        self.wl = wl
+        self.ww = ww
+
         self._init_gui()
         self._bind_events_wx()
 
     def _init_gui(self):
         self.clut_widget = clut_imagedata.CLUTImageDataWidget(self, -1,
-                                                              np.random.randint(0,
-                                                                               1000,
-                                                                               (1000,)),
-                                                              -1000, 1000,
-                                                             230, 255)
+                                                              self.histogram,
+                                                              self.init,
+                                                              self.end,
+                                                              self.wl, self.ww)
         sizer = wx.BoxSizer(wx.VERTICAL)
         sizer.Add(self.clut_widget, 1, wx.EXPAND)
 
diff --git a/invesalius/gui/widgets/slice_menu.py b/invesalius/gui/widgets/slice_menu.py
index 9b25d5d..067c3fd 100644
--- a/invesalius/gui/widgets/slice_menu.py
+++ b/invesalius/gui/widgets/slice_menu.py
@@ -23,7 +23,9 @@ import sys
 
 import wx
 from wx.lib.pubsub import pub as Publisher
+
 import constants as const
+import data.slice_ as sl
 import presets
 
 from gui.dialogs import ClutImagedataDialog
@@ -188,7 +190,14 @@ class SliceMenu(wx.Menu):
             Publisher.sendMessage('Update slice viewer')
 
         elif key == _('Custom'):
-            cdialog = ClutImagedataDialog()
+            slc = sl.Slice()
+            histogram = slc.histogram
+            init = slc.matrix.min()
+            end = slc.matrix.max()
+            wl = slc.window_level
+            ww = slc.window_width
+
+            cdialog = ClutImagedataDialog(histogram, init, end, wl, ww)
             cdialog.Show()
 
 
--
libgit2 0.21.2