Still problem with special characters in filenames when Paperclip let´'s identify validate the file. Platform dependent. In my case, Win7. With reference to https://github.com/thoughtbot/paperclip/pull/1154 2013-02-14 10:20 CET

gistfile1.txt

###########################################
# A. DEVELOPMENT ENVIRONMENT
# Win7/64
-------------------------------------------

# Excerpt from Gemfile.lock

GIT
  remote: git://github.com/thoughtbot/paperclip.git
  revision: e421bc1b0d5806f53be8a664c5f3c70c2e285e7e
  specs:
    paperclip (3.4.0)
      activemodel (>= 3.0.0)
      activerecord (>= 3.0.0)
      activesupport (>= 3.0.0)
      cocaine (~> 0.5.0)
      mime-types

GEM
  remote: http://rubygems.org/
  specs:
    climate_control (0.0.3)
      activesupport (>= 3.0)
    cocaine (0.5.1)
      climate_control (>= 0.0.3, < 1.0)
    mime-types (1.21)
    rails (3.2.12)
    fog (1.9.0)    
    

PLATFORMS
  x86-mingw32

-------------------------------------------

$ ruby -v
ruby 1.9.3p194 (2012-04-20) [i386-mingw32]
$ which identify
/c/Program Files (x86)/ImageMagick-6.8.0-Q16/identify

-------------------------------------------
# Excerpt from config/environments/development.rb

  config.paperclip_defaults = {
      :storage => :fog,
      :fog_public => true,
      :fog_directory => 'development.allom.se',
      :fog_host => 'http://development.allom.se.s3-external-3.amazonaws.com',
      :fog_credentials => {
        :aws_access_key_id => ENV['S3_KEY'],
        :aws_secret_access_key => ENV['S3_SECRET'],
        :provider => 'AWS',
        :region => 'eu-west-1'
      }
    }
    
-------------------------------------------
# Excerpt from app/models/organizer.rb    

  validates_attachment_content_type :logotype, :content_type => /image/
  validates_attachment_size :logotype, :in => 0..10.megabytes

  has_attached_file :logotype, 
                    :default_url => "missing-organizer-logotype.png", 
                    :path => "organizers/:attachment/:id/:style/:filename",
                    :styles => {  
                      :medium => "256x256", 
                      :small => "90x90"}
                      
-------------------------------------------
# Manual test cases
1. Upload the file "lumano.gif".
Success
2. Upload the file "låmano.gif"
Fail. Error message:

Paperclip::Errors::NotIdentifiedByImageMagickError


# Excerpt from log/development

[495b9a0570d208456f4e735671b0ff94] [127.0.0.1]   CACHE (0.0ms)  SELECT "organizers".* FROM "organizers" WHERE "organizers"."slug" = 'jazz-pa-malaroarna' LIMIT 1
[495b9a0570d208456f4e735671b0ff94] [127.0.0.1]    (0.0ms)  begin transaction
[495b9a0570d208456f4e735671b0ff94] [127.0.0.1] Command :: identify -format '%wx%h,%[exif:orientation]' "C:/Users/STEFAN~1/AppData/Local/Temp/låmano20130214-8520-147onsm.gif[0]"
[495b9a0570d208456f4e735671b0ff94] [127.0.0.1] [paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
[495b9a0570d208456f4e735671b0ff94] [127.0.0.1] Command :: identify -format '%wx%h,%[exif:orientation]' "C:/Users/STEFAN~1/AppData/Local/Temp/låmano20130214-8520-147onsm.gif[0]"
[495b9a0570d208456f4e735671b0ff94] [127.0.0.1] [paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
[495b9a0570d208456f4e735671b0ff94] [127.0.0.1]    (0.0ms)  rollback transaction
[495b9a0570d208456f4e735671b0ff94] [127.0.0.1]   User Load (1.0ms)  SELECT "users".* FROM "users" INNER JOIN "memberships" ON "users"."id" = "memberships"."user_id" WHERE "memberships"."organizer_id" = 114 ORDER BY email


###########################################
# B. DEVELOPMENT ENVIRONMENT 
# without S3 storage

-------------------------------------------
# Excerpt from config/environments/development.rb

  config.paperclip_defaults = {
    }
    
-------------------------------------------
# Manual test cases
1. Upload the file "lumano.gif".
Success
2. Upload the file "låmano.gif"
Fail. Error message:

Paperclip::Errors::NotIdentifiedByImageMagickError





###########################################
# C. STAGE ENVIRONMENT                      
# Heroku

Stack: cedar

-------------------------------------------
# Manual test cases
1. Upload the file "lumano.gif".
Success
2. Upload the file "låmano.gif"
Success