From 5877e2ee3d6cc879b6fe045452011885198d0557 Mon Sep 17 00:00:00 2001
From: Steven Silvester <steven.silvester@ieee.org>
Date: Sat, 13 Sep 2014 07:42:52 -0500
Subject: [PATCH] Remove blit background when overlay changes

---
 skimage/viewer/plugins/overlayplugin.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/skimage/viewer/plugins/overlayplugin.py b/skimage/viewer/plugins/overlayplugin.py
index 7f016328..63ff61a3 100644
--- a/skimage/viewer/plugins/overlayplugin.py
+++ b/skimage/viewer/plugins/overlayplugin.py
@@ -65,6 +65,9 @@ class OverlayPlugin(Plugin):
         else:
             update_axes_image(self._overlay_plot, image)
 
+        if self.image_viewer.useblit:
+            self.image_viewer._blit_manager.background = None
+
         self.image_viewer.redraw()
 
     @property