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@@ -153,6 +153,22 @@ module Paperclip
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       }
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     end
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+    # This method really shouldn't be called that often. It's expected use is in the
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+    # paperclip:refresh rake task and that's it. It will regenerate all thumbnails
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+    # forcefully, by reobtaining the original file and going through the post-process
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+    # again.
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+    def reprocess!
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+      new_original = Tempfile.new("paperclip-reprocess")
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+      old_original = to_file(:original)
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+      new_original.write( old_original.read )
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+      new_original.rewind
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+
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+      @queued_for_write = { :original => new_original }
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+      post_process
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+
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+      old_original.close if old_original.respond_to?(:close)
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+    end
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+
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     private
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     def valid_assignment? file #:nodoc:

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@@ -25,7 +25,7 @@ namespace :paperclip do
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     instances.each do |instance|
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       names.each do |name|
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         result = if instance.send("#{ name }?")
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-          instance.send(name).send("post_process")
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+          instance.send(name).reprocess!
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           instance.send(name).save
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         else
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           true