diff --git a/invesalius/data/surface_process.py b/invesalius/data/surface_process.py
index 1604e14..8aff2fe 100644
--- a/invesalius/data/surface_process.py
+++ b/invesalius/data/surface_process.py
@@ -95,7 +95,7 @@ class SurfaceProcess(multiprocessing.Process):
                 del gauss
                 del a_mask
             else:
-                image =  converters.to_vtk(a_image, self.spacing, roi.start,
+                image = converters.to_vtk(a_image, self.spacing, roi.start,
                                            "AXIAL")
             del a_image
 
diff --git a/invesalius/gui/dialogs.py b/invesalius/gui/dialogs.py
index f957430..a21672c 100644
--- a/invesalius/gui/dialogs.py
+++ b/invesalius/gui/dialogs.py
@@ -873,17 +873,17 @@ class NewSurfaceDialog(wx.Dialog):
         keep_largest = self.check_box_largest.GetValue()
         return (mask_index, surface_name, quality, fill_holes, keep_largest)
 
-INDEX_TO_EXTENSION = {0: "bmp", 1: "jpg", 2: "png", 3: "ps", 4:"povray", 5:"tiff"}
-WILDCARD_SAVE_PICTURE = _("BMP image")+" (*.bmp)|*.bmp|"+\
-                            _("JPG image")+" (*.jpg)|*.jpg|"+\
-                            _("PNG image")+" (*.png)|*.png|"+\
-                            _("PostScript document")+" (*.ps)|*.ps|"+\
-                            _("POV-Ray file")+" (*.pov)|*.pov|"+\
-                            _("TIFF image")+" (*.tif)|*.tif"
 
 
 def ExportPicture(type_=""):
     import constants as const
+    INDEX_TO_EXTENSION = {0: "bmp", 1: "jpg", 2: "png", 3: "ps", 4:"povray", 5:"tiff"}
+    WILDCARD_SAVE_PICTURE = _("BMP image")+" (*.bmp)|*.bmp|"+\
+                                _("JPG image")+" (*.jpg)|*.jpg|"+\
+                                _("PNG image")+" (*.png)|*.png|"+\
+                                _("PostScript document")+" (*.ps)|*.ps|"+\
+                                _("POV-Ray file")+" (*.pov)|*.pov|"+\
+                                _("TIFF image")+" (*.tif)|*.tif"
 
     INDEX_TO_TYPE = {0: const.FILETYPE_BMP,
                 1: const.FILETYPE_JPG,
diff --git a/invesalius/project.py b/invesalius/project.py
index a9d2f3c..bb420c7 100755
--- a/invesalius/project.py
+++ b/invesalius/project.py
@@ -30,7 +30,6 @@ from wx.lib.pubsub import pub as Publisher
 import vtk
 
 import constants as const
-import data.imagedata_utils as iu
 import data.mask as msk
 import data.polydata_utils as pu
 import data.surface as srf
--
libgit2 0.21.2