Index: test/processors/core_image_test.rb
===================================================================
--- test/processors/core_image_test.rb	(revision 3183)
+++ test/processors/core_image_test.rb	(working copy)
@@ -22,6 +22,12 @@
       # test geometry string
       assert_equal 31, geo.width
       assert_equal 41, geo.height
+      
+      # This makes sure that we didn't overwrite the original file
+      # and will end up with a thumbnail instead of the original
+      assert_equal 42, attachment.width
+      assert_equal 55, attachment.height
+      
     end
   else
     def test_flunk
Index: lib/technoweenie/attachment_fu/processors/core_image_processor.rb
===================================================================
--- lib/technoweenie/attachment_fu/processors/core_image_processor.rb	(revision 3183)
+++ lib/technoweenie/attachment_fu/processors/core_image_processor.rb	(working copy)
@@ -44,6 +44,9 @@
             processor.render do |result|
               self.width  = result.extent.size.width  if respond_to?(:width)
               self.height = result.extent.size.height if respond_to?(:height)
+              
+              # Get a new temp_path for the image before saving
+              self.temp_path = Tempfile.new(random_tempfile_filename, Technoweenie::AttachmentFu.tempfile_path).path
               result.save self.temp_path, OSX::NSJPEGFileType
               self.size = File.size(self.temp_path)
             end