app/uploaders/picture_uploader.rb

@@ -30,6 +30,11 @@ class PictureUploader < CarrierWave::Uploader::Base
   # end
 
   # Create different versions of your uploaded files:
+
+  version :medium do
+    process :resize_to_fit => [171, 180]
+  end
+
   version :thumb do
     process :resize_to_fit => [50, 50]
   end