Paperclip Cropper

cropper.rb

# http://pastie.org/995357

module Paperclip  
  class Cropper < Thumbnail  
    def transformation_command  
      if crop_command
        puts "CROP: #{crop_command + super.join(' ').sub(/ -crop \S+/, '').split(' ')}"
        crop_command + super.join(' ').sub(/ -crop \S+/, '').split(' ')
      else  
        super  
      end  
    end  
  
    def crop_command  
      target = @attachment.instance  
      if target.cropping?  
        ["-crop", "#{target.crop_w}x#{target.crop_h}+#{target.crop_x}+#{target.crop_y}"]
      end  
    end  
  end  
end

Found this approach a bit cleaner: http://viget.com/extend/manual-cropping-with-paperclip

def transformation_command
  target = @attachment.instance
  crop_command = []
  if target.cropping?
    crop_command = [
      "-crop",
      "#{target.crop_w}x" \
        "#{target.crop_h}+" \
        "#{target.crop_x}+" \
        "#{target.crop_y}",
      "+repage"
    ]
  end
  crop_command + super
end