diff --git a/lib/delayed_paperclip.rb b/lib/delayed_paperclip.rb
index 047126e..2cd5379 100644
--- a/lib/delayed_paperclip.rb
+++ b/lib/delayed_paperclip.rb
@@ -10,7 +10,10 @@ def options
         :background_job_class => DelayedPaperclip::ProcessJob,
         :url_with_processing  => true,
         :processing_image_url => nil,
-        :queue => "paperclip"
+        :queue => "paperclip",
+        :post_processing_callback => nil,
+        :pre_processing_callback => nil,
+        :post_update_callback => nil
       }
     end
 
@@ -54,7 +57,10 @@ def process_in_background(name, options = {})
         :only_process => only_process_default,
         :url_with_processing => DelayedPaperclip.options[:url_with_processing],
         :processing_image_url => DelayedPaperclip.options[:processing_image_url],
-        :queue => DelayedPaperclip.options[:queue]
+        :queue => DelayedPaperclip.options[:queue],
+        :post_processing_callback => nil,
+        :pre_processing_callback => nil,
+        :post_update_callback => nil
       }.each do |option, default|
         paperclip_definitions[name][:delayed][option] = options.key?(option) ? options[option] : default
       end
diff --git a/lib/delayed_paperclip/attachment.rb b/lib/delayed_paperclip/attachment.rb
index 2b6f8d1..08ebb97 100644
--- a/lib/delayed_paperclip/attachment.rb
+++ b/lib/delayed_paperclip/attachment.rb
@@ -48,11 +48,14 @@ def delayed_only_process
     end
 
     def process_delayed!
+      run_callback :pre_processing_callback
       self.job_is_processing = true
       self.post_processing = true
       reprocess!(*delayed_only_process)
+      run_callback :post_processing_callback
       self.job_is_processing = false
       update_processing_column
+      run_callback :post_update_callback
     end
 
     def processing_image_url
@@ -85,5 +88,24 @@ def update_processing_column
       end
     end
 
+    def run_callback(callback_name)
+      execute_callback delayed_options[callback_name]
+    end
+
+    def execute_callback(callback)
+      case callback
+        when Proc
+          callback.call self
+        when Symbol, String
+          method = instance.method callback
+          arity = method.arity
+          if arity == 1
+            method.call self
+          else
+            method.call
+          end
+      end
+    end
+
   end
 end
diff --git a/spec/delayed_paperclip/attachment_spec.rb b/spec/delayed_paperclip/attachment_spec.rb
index 0a5cf6f..8c924cb 100644
--- a/spec/delayed_paperclip/attachment_spec.rb
+++ b/spec/delayed_paperclip/attachment_spec.rb
@@ -15,7 +15,10 @@
         :only_process => [],
         :url_with_processing => true,
         :processing_image_url => nil,
-        :queue => "paperclip"
+        :queue => "paperclip",
+        :post_processing_callback => nil,
+        :post_update_callback => nil,
+        :pre_processing_callback => nil
       })
     end
   end
diff --git a/spec/delayed_paperclip/class_methods_spec.rb b/spec/delayed_paperclip/class_methods_spec.rb
index 52dc1e1..d2a8877 100644
--- a/spec/delayed_paperclip/class_methods_spec.rb
+++ b/spec/delayed_paperclip/class_methods_spec.rb
@@ -18,7 +18,10 @@
           :only_process => [],
           :url_with_processing => true,
           :processing_image_url => nil,
-          :queue => "paperclip"}
+          :queue => "paperclip",
+          :post_processing_callback => nil,
+          :post_update_callback => nil,
+          :pre_processing_callback => nil }
         }
       }
     end
@@ -31,7 +34,10 @@
           :only_process => [],
           :url_with_processing => true,
           :processing_image_url => nil,
-          :queue => "custom"}
+          :queue => "custom",
+          :post_processing_callback => nil,
+          :post_update_callback => nil,
+          :pre_processing_callback => nil }
         }
       })
     end
@@ -48,7 +54,10 @@
             :only_process => [],
             :url_with_processing => true,
             :processing_image_url => "/processing/url",
-            :queue => "paperclip"}
+            :queue => "paperclip",
+            :post_processing_callback => nil,
+            :post_update_callback => nil,
+            :pre_processing_callback => nil }
           }
         }
       end
@@ -68,7 +77,10 @@
             :only_process => [:small, :large],
             :url_with_processing => true,
             :processing_image_url => nil,
-            :queue => "paperclip"}
+            :queue => "paperclip",
+            :post_processing_callback => nil,
+            :post_update_callback => nil,
+            :pre_processing_callback => nil }
           }
         }
       end
diff --git a/spec/delayed_paperclip_spec.rb b/spec/delayed_paperclip_spec.rb
index a9650d9..756ed37 100644
--- a/spec/delayed_paperclip_spec.rb
+++ b/spec/delayed_paperclip_spec.rb
@@ -10,7 +10,10 @@
       DelayedPaperclip.options.should == {:background_job_class => DelayedPaperclip::ProcessJob,
                                           :url_with_processing => true,
                                           :processing_image_url => nil,
-                                          :queue => "paperclip"}
+                                          :queue => "paperclip",
+                                          :post_processing_callback => nil,
+                                          :post_update_callback => nil,
+                                          :pre_processing_callback => nil }
     end
   end
 
@@ -58,9 +61,12 @@
                                                             :only_process => [],
                                                             :url_with_processing => true,
                                                             :processing_image_url => nil,
-                                                            :queue => "paperclip"}
+                                                            :queue => "paperclip",
+                                                            :post_processing_callback => nil,
+                                                            :post_update_callback => nil,
+                                                            :pre_processing_callback => nil }
                                                           }
                                               })
     end
   end
-end
\ No newline at end of file
+end