diff -Nuar tilecache-2.11.orig/TileCache/Layer.py tilecache-2.11/TileCache/Layer.py
--- tilecache-2.11.orig/TileCache/Layer.py	2010-10-15 04:00:18.000000000 -0700
+++ tilecache-2.11/TileCache/Layer.py	2013-11-09 11:05:17.620475332 -0800
@@ -391,7 +391,7 @@
         return MetaTile(self, x, y, tile.z) 
 
     def renderMetaTile (self, metatile, tile):
-        import StringIO, Image
+        import StringIO, PIL.Image as Image
 
         data = self.renderTile(metatile)
         image = Image.open( StringIO.StringIO(data) )
@@ -444,7 +444,7 @@
                 return self.renderTile(tile)
 
     def watermark (self, img):
-        import StringIO, Image, ImageEnhance
+        import StringIO, PIL.Image as Image, PIL.ImageEnhance as ImageEnhance
         tileImage = Image.open( StringIO.StringIO(img) )
         wmark = Image.open(self.watermarkimage)
         assert self.watermarkopacity >= 0 and self.watermarkopacity <= 1