diff --git a/openerp/addons/base/res/res_partner.py b/openerp/addons/base/res/res_partner.py
index 78ce41f7cfd..eaf23347270 100644
--- a/openerp/addons/base/res/res_partner.py
+++ b/openerp/addons/base/res/res_partner.py
@@ -5,6 +5,7 @@ import datetime
 from lxml import etree
 import math
 import pytz
+import threading
 import urlparse
 
 import openerp
@@ -303,6 +304,9 @@ class res_partner(osv.Model, format_address):
 
     @api.model
     def _get_default_image(self, is_company, colorize=False):
+        if getattr(threading.currentThread(), 'testing', False) or self.env.context.get('install_mode'):
+            return False
+
         img_path = openerp.modules.get_module_resource(
             'base', 'static/src/img', 'company_image.png' if is_company else 'avatar.png')
         with open(img_path, 'rb') as f:
diff --git a/openerp/tools/image.py b/openerp/tools/image.py
index 5261e9037e4..c6d0ad9aa43 100644
--- a/openerp/tools/image.py
+++ b/openerp/tools/image.py
@@ -8,7 +8,7 @@ except ImportError:
 
 from PIL import Image
 from PIL import ImageEnhance
-from random import randint
+from random import randrange
 
 # ----------------------------------------
 # Image resizing
@@ -213,7 +213,7 @@ def image_colorize(original, randomize=True, color=(255, 255, 255)):
     image = Image.new('RGB', original.size)
     # generate the background color, past it as background
     if randomize:
-        color = (randint(32, 224), randint(32, 224), randint(32, 224))
+        color = (randrange(32, 224, 24), randrange(32, 224, 24), randrange(32, 224, 24))
     image.paste(color)
     image.paste(original, mask=original)
     # return the new image