pch

class User
  has_attached_file :photo,
                    :processors => [:watermark],
                    :styles => {
                      :medium => {
                        :geometry       => "300x300>",
                        :watermark_path => "#{Rails.root}/public/images/watermark.png"
                      },
                      :thumb => "100x100>",
                    }

zimbatm

/* Temporary disable $stdout
============================

This method works for Ruby and new sub-processes.

I have seen other techniques on the net which re-assign $stdout with another IO,
but then the sub-processes will still use the old stdout.

*/