diff --git a/openlp/core/lib/renderer.py b/openlp/core/lib/renderer.py
index a8f4e842f..7c3189789 100644
--- a/openlp/core/lib/renderer.py
+++ b/openlp/core/lib/renderer.py
@@ -56,11 +56,11 @@ class Renderer(object):
     """
     log.info(u'Renderer Loaded')
 
-    def __init__(self, image_manager, theme_manager):
+    def __init__(self, imageManager, theme_manager):
         """
         Initialise the render manager.
 
-    ``image_manager``
+    ``imageManager``
         A ImageManager instance which takes care of e. g. caching and resizing
         images.
 
@@ -69,7 +69,7 @@ class Renderer(object):
         """
         log.debug(u'Initialisation started')
         self.theme_manager = theme_manager
-        self.image_manager = image_manager
+        self.imageManager = imageManager
         self.screens = ScreenList.get_instance()
         self.service_theme = u''
         self.theme_level = u''
@@ -77,7 +77,7 @@ class Renderer(object):
         self.theme_data = None
         self.bg_frame = None
         self.force_page = False
-        self.display = MainDisplay(None, self.image_manager, False)
+        self.display = MainDisplay(None, self.imageManager, False)
         self.display.setup()
 
     def update_display(self):
@@ -88,7 +88,7 @@ class Renderer(object):
         self._calculate_default(self.screens.current[u'size'])
         if self.display:
             self.display.close()
-        self.display = MainDisplay(None, self.image_manager, False)
+        self.display = MainDisplay(None, self.imageManager, False)
         self.display.setup()
         self.bg_frame = None
         self.theme_data = None
@@ -167,7 +167,7 @@ class Renderer(object):
         self._build_text_rectangle(self.theme_data)
         # if No file do not update cache
         if self.theme_data.background_filename:
-            self.image_manager.add_image(self.theme_data.theme_name,
+            self.imageManager.add_image(self.theme_data.theme_name,
                 self.theme_data.background_filename)
         return self._rect, self._rect_footer
 
@@ -193,7 +193,7 @@ class Renderer(object):
             # make big page for theme edit dialog to get line count
             serviceItem.add_from_text(u'', VERSE + VERSE + VERSE)
         else:
-            self.image_manager.del_image(theme_data.theme_name)
+            self.imageManager.del_image(theme_data.theme_name)
             serviceItem.add_from_text(u'', VERSE)
         serviceItem.renderer = self
         serviceItem.raw_footer = FOOTER
diff --git a/openlp/core/lib/serviceitem.py b/openlp/core/lib/serviceitem.py
index ced78ad68..2ab09dbeb 100644
--- a/openlp/core/lib/serviceitem.py
+++ b/openlp/core/lib/serviceitem.py
@@ -208,7 +208,7 @@ class ServiceItem(object):
         """
         self.service_item_type = ServiceItemType.Image
         self._raw_frames.append({u'title': title, u'path': path})
-        self.renderer.image_manager.add_image(title, path)
+        self.renderer.imageManager.add_image(title, path)
         self._new_item()
 
     def add_from_text(self, title, raw_slide, verse_tag=None):
diff --git a/openlp/core/ui/maindisplay.py b/openlp/core/ui/maindisplay.py
index b661b1e49..1b9098816 100644
--- a/openlp/core/ui/maindisplay.py
+++ b/openlp/core/ui/maindisplay.py
@@ -48,13 +48,13 @@ class MainDisplay(QtGui.QGraphicsView):
     """
     This is the display screen.
     """
-    def __init__(self, parent, image_manager, live):
+    def __init__(self, parent, imageManager, live):
         if live:
             QtGui.QGraphicsView.__init__(self)
         else:
             QtGui.QGraphicsView.__init__(self, parent)
         self.isLive = live
-        self.image_manager = image_manager
+        self.imageManager = imageManager
         self.screens = ScreenList.get_instance()
         self.alertTab = None
         self.hideMode = None
@@ -232,7 +232,7 @@ class MainDisplay(QtGui.QGraphicsView):
         """
         API for replacement backgrounds so Images are added directly to cache
         """
-        self.image_manager.add_image(name, path)
+        self.imageManager.add_image(name, path)
         self.image(name)
         if hasattr(self, u'serviceItem'):
             self.override[u'image'] = name
@@ -247,7 +247,7 @@ class MainDisplay(QtGui.QGraphicsView):
             The name of the image to be displayed
         """
         log.debug(u'image to display')
-        image = self.image_manager.get_image_bytes(name)
+        image = self.imageManager.get_image_bytes(name)
         self.resetVideo()
         self.displayImage(image)
         return self.preview()
@@ -477,13 +477,13 @@ class MainDisplay(QtGui.QGraphicsView):
                 self.override = {}
             else:
                 # replace the background
-                background = self.image_manager. \
+                background = self.imageManager. \
                     get_image_bytes(self.override[u'image'])
         if self.serviceItem.themedata.background_filename:
-            self.serviceItem.bg_image_bytes = self.image_manager. \
+            self.serviceItem.bg_image_bytes = self.imageManager. \
                 get_image_bytes(self.serviceItem.themedata.theme_name)
         if image:
-            image_bytes = self.image_manager.get_image_bytes(image)
+            image_bytes = self.imageManager.get_image_bytes(image)
         else:
             image_bytes = None
         html = build_html(self.serviceItem, self.screen, self.alertTab,