fix pil thumbnails

vispa/remote/filesystem.py

@@ -13,9 +13,9 @@ import shutil
 import stat
 import subprocess
 
-
 try:
     import Image
+    import ImageFilter
     HAVE_PIL = True
 except:
     HAVE_PIL = False
@@ -389,11 +389,15 @@ class FileSystem(object):
     def expand(self, path):
         return os.path.expanduser(os.path.expandvars(path))
 
-    def thumbnail(self, path, width=100, height=100):
+    def thumbnail(self, path, width=100, height=100, sharpen=True):
         path = self.expand(path)
         if HAVE_PIL:
             output = StringIO()
-            Image.open(path).thumbnail((width, height)).save(output, "png")
+            img = Image.open(path)
+            img.thumbnail((width, height))
+            if sharpen:
+                im.filter(ImageFilter.SHARPEN)
+            img.save(output, "JPEG")
             contents = output.getvalue()
             output.close()
             return contents