title: How to set Paperclip to process original image?
body: <p>Using Paperclip Gem in a Rails 4 project to attach an image and then clean out all exif data, like this:</p>
  
  <pre><code>  has_attached_file :image,
      styles: lambda{ |a|
                            { 
                              large:      ['800x', :png],
                              thumb_340:  ['340x340#', :png],
                              thumb_180:  ['180x180#', :png]
                            }
                    },
      convert_options: { all: '-strip' }
  </code></pre>
  
  <p>Problem is, <code>convert_options</code> isn't getting called on the original image. What's the best method for reprocessing (or pre-processing) the original to make sure that <code>'-strip'</code> gets called?</p>