diff --git a/doc/source/conf.py b/doc/source/conf.py
index 727b4bc4..aa96481b 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -259,3 +259,6 @@ plot_include_source = True
 plot_formats = [('png', 100)]
 
 plot2rst_index_name = 'README'
+plot2rst_rcparams = {'image.cmap' : 'gray',
+                     'image.interpolation' : 'none'}
+