Paperclip processor to convert PDF to JPG to go around problems with the old versions of imagemagick and ghostscript available on Heroku. This file is located in [APP_ROOT]/lib/paperclip_processors/ghostscript.rb

content.rb

# Model using the ghostscript processor
class Content < ActiveRecord::Base
  
  has_attached_file :resource,
                    :styles => { :preview => ["725x1200>", :jpg], :thumb => ["100x140>", :jpg] },
                    :processors => [:ghostscript, :thumbnail],
                    :convert_options => { :all => '-colorspace RGB -flatten -density 300 -quality 100' }, 
                    :path => ":page_path/:class/:id/:resource_token/:style/:filename"
end

ghostscript.rb

module Paperclip
  class Ghostscript < Processor

    attr_accessor :current_geometry, :target_geometry, :format, :whiny, :convert_options, :source_file_options

    def initialize file, options = {}, attachment = nil
      super
      @file                = file
      @format              = options[:format]

      @current_format      = File.extname(@file.path)
      @basename            = File.basename(@file.path, @current_format)
    end

    def make
      src = @file
      dst = Tempfile.new([@basename, @format ? ".#{@format}" : ''])
      dst.binmode

      begin
        parameters = []
        parameters << "-dNOPAUSE -dBATCH -sDEVICE=jpeg -r144 -dUseCIEColor -dFirstPage=1 -dLastPage=1"
        parameters << "-sOutputFile=:dest"
        parameters << ":source"

        parameters = parameters.flatten.compact.join(" ").strip.squeeze(" ")
        
        success = Paperclip.run("gs", parameters, :source => "#{File.expand_path(src.path)}", :dest => File.expand_path(dst.path))
      rescue PaperclipCommandLineError => e
        raise PaperclipError, "There was an error processing the thumbnail for #{@basename}" if @whiny
      end
      dst
    end
  end
end

Hello

I am trying to use your script to generate jpgs for pdfs without success.

I have an older development environment:
shajizaidi@Spock:/Softdev/e-mangue/script$ rails -v
Rails 2.3.8
shajizaidi@Spock:/Softdev/e-mangue/script$ ruby -v
ruby 1.8.7 (2011-12-28 patchlevel 357) [i686-linux]

And relevant gems:
aasm (3.0.1)
actionmailer (2.3.8, 2.2.2)
actionpack (2.3.8, 2.2.2)
activemodel (3.1.3)
activerecord (2.3.8, 2.2.2)
activeresource (2.3.8, 2.2.2)
activesupport (3.1.3, 2.3.8, 2.2.2)
arel (2.2.1)
git (1.2.5)
hpricot (0.8.5)
httpclient (2.2.4)
mysql (2.8.1)
passenger (3.0.11)
rack (1.4.0, 1.1.3)
rails (2.3.8, 2.2.2)
rake (0.9.2)
ruby-blockcache (0.2)
rubygems-update (1.5.3)
rubyist-aasm (2.1.1)
soap4r (1.5.8)

The excerpt from my Model is below:
class Issue < ActiveRecord::Base
include AASM

belongs_to :publication
has_many :readings
has_many :readers, :through => :readings, :class_name => "User"

has_many :issue_metadatas, :dependent => :destroy
has_many :table_of_contents_entries, :dependent => :destroy

has_many :issue_ratings

has_one :issue_status, :dependent => :destroy

has_attached_file :pdf,

:url => "/assets/:id/",

:path => ":rails_root/assets/docs/:id/:style/:basename.:extension",

                :styles => {

:icon => ["60X80#", :jpg],

                            :thumb => ["360x480#", :jpg]

:large => ["X800", :jpg]

                            },
                :processors => [:ghostscript, :thumbnail],
                :convert_options => {:all => '-colorspace RGB -flatten -density 300 -quality 100'},
                :path => ":page_path/:class/:id/:resource_token/:style/:filename"

validates_presence_of :issue_number
validates_presence_of :title
validates_presence_of :date

When I try to upload a pdf I get the following error:
RuntimeError (cannot generate tempfile '): /home/shajizaidi/.rvm/rubies/ruby-1.8.7-p357/lib/ruby/1.8/tempfile.rb:52:ininitialize'
lib/paperclip_processors/ghostscript.rb:17:in new' lib/paperclip_processors/ghostscript.rb:17:inmake'
app/controllers/issues_controller.rb:79:in new' app/controllers/issues_controller.rb:79:increate'

In ghostscript.rb

To test if I change the way the temp file is being generated by not using an array for example:
dst = Tempfile.new(“#@basename})

instead of:
dst = Tempfile.new([@basename, @Format ? ".#{@Format}" : ''])

I don't get the error; but then of course the file name of the temp file is not correctly generated.

I have tried to research this quite a bit and cant seem to find a solution.

Any help would be greatly appreciated.

Thanks

Shaji

@DiOssTech: Please repair the markup of your comment. Try explicit code highlighting using

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where necessary.
Cheers.