Paperclip module to crop and rotate images
Ruby
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README
croppertator.rb

README

Sample Usage
=============

Note: 
Cropping and Rotating are done in different views.

user.rb

after_update :reprocess_avatar, :if => :cropping?

has_attached_file :avatar, :styles => { 
  :thumb => {:geometry => "100x100#", :processors => [:croppertator]}, 
  :large => {:geometry => "500x500>"} 
}

attr_accessor :rotation_degrees, :rotate

def rotate!(degrees = 90)
  self.rotation += degrees
  self.rotation -= 360 if self.rotation >= 360
  self.rotation += 360 if self.rotation <= -360

  self.rotate = true
  self.avatar.reprocess!
  self.save
end

def rotating?
  !self.rotation.nil? and self.rotate
end

def cropping?
  !crop_x.blank? && !crop_y.blank? && !crop_w.blank? && !crop_h.blank?
end

def avatar_geometry(style = :original)  
  @geometry ||= {}  
  @geometry[style] ||= Paperclip::Geometry.from_file(avatar.path(style))  
end

def ratio
  avatar_geometry(:original).width/avatar_geometry(:large).width
end

private

def reprocess_avatar
  avatar.reprocess!  
end