diff --git a/Rakefile b/Rakefile
index 8c0ad93..6a0e31b 100644
--- a/Rakefile
+++ b/Rakefile
@@ -24,7 +24,7 @@ spec = Gem::Specification.new do |s|
   s.add_development_dependency("kelredd-useful", [">= 0.4.0"])
   s.add_development_dependency("kelredd-simple-gem", [">= 0.7.0"])
 
-  s.add_dependency('mini_magick')
+  s.add_dependency('mini_magick', "~>2.1")
   s.add_dependency('flvtool2')
 end
 
diff --git a/lib/pruview/document.rb b/lib/pruview/document.rb
index d91b1ec..33cbf87 100644
--- a/lib/pruview/document.rb
+++ b/lib/pruview/document.rb
@@ -1,9 +1,9 @@
 module Pruview
 
   class Document
-    
+
     TMP_DIR = '/tmp'
-    
+
     def initialize(source, target_dir, target_permission=0666)
       raise Pruview::Exceptions::InvalidError, "Invalid source file: #{source.to_s}" if !File.file?(source)
       raise Pruview::Exceptions::InvalidError, "Invalid target directory: #{target_dir.to_s}" if !File.directory?(target_dir)
@@ -14,11 +14,11 @@ def initialize(source, target_dir, target_permission=0666)
       @image = process_image(get_image(source))
       @tempfile = nil
     end
-  
+
     def to_jpg(name, width, height, crop = false)
       scale_img = scale_image(width, height, crop)
+      scale_img.format 'jpg'
       scale_img.combine_options do |img|
-        img.format 'jpg'
         img.quality '90'
         img.interlace 'plane'
       end
@@ -29,9 +29,9 @@ def to_jpg(name, width, height, crop = false)
       FileUtils.mv(tmp_target, target, :force => true)
       return target
     end
-    
+
   protected
-  
+
     def format_supported?(source)
       file_ext = file_extension(source)
       #return true if file_ext == PSD_EXT  # don't support photoshop for now
@@ -39,17 +39,17 @@ def format_supported?(source)
       IMAGE_EXT.each { |extension| return true if file_ext == extension }
       return false
     end
-    
+
     def format_postscript?(source)
       file_ext = file_extension(source)
       POSTSCRIPT_EXT.each { |extension| return true if file_ext == extension }
       return false
     end
-    
+
     def file_extension(source_file)
-       File.extname(source_file).downcase.chomp  
+       File.extname(source_file).downcase.chomp
     end
-    
+
     def get_image(source)
       source = get_postscript_source(source) if format_postscript?(source)
       begin
@@ -58,7 +58,7 @@ def get_image(source)
         raise "Error reading source image: #{err.message}"
       end
     end
-    
+
     def get_postscript_source(source)
       begin
         @tempfile = MiniMagick::ImageTempFile.new("pruview.jpg")
@@ -69,14 +69,14 @@ def get_postscript_source(source)
       run_system_command("convert -format jpg \"#{source}[0]\" \"#{@tempfile.path}\"", "Error processing postscript document")
       return @tempfile.path
     end
-    
+
     def process_image(image)
       image.format PROCESS_FORMAT
       set_RGB_colorspace(image)
       image.strip
       return image
     end
-    
+
     def set_RGB_colorspace(image)
       colorspace = run_system_command("identify -format \"%r\" #{image.path}", "Error reading document colorspace")
       puts "Colorspace: #{colorspace}"
@@ -93,13 +93,13 @@ def scale_image(width, height, crop = false)
       begin
         image = MiniMagick::Image.from_file(@image.path)
         crop_image(image, crop)
-        image.resize "#{width}x#{height}" if crop || @image[:width].to_i > width || @image[:height] > height 
+        image.resize "#{width}x#{height}" if crop || @image[:width].to_i > width || @image[:height] > height
         return image
       rescue Exception => err
         raise "Error scaling image: #{err.message}"
       end
     end
-    
+
     def crop_image(image, ratio)
       if ratio.kind_of?(Array) && ratio.length == 2
         ratio_width, ratio_height = ratio
@@ -124,18 +124,18 @@ def crop_image(image, ratio)
       end
       return image
     end
-    
+
     def run_system_command(command, error_message)
       output = `#{command}`
       raise "#{error_message}: error given #{$?}\n#{output}" if $? != 0
       return output
     end
-    
+
   end
-  
+
   # Configurations
   Document::PROCESS_FORMAT = 'jpg'
-  
+
   Document::PSD_EXT = '.psd'
   Document::POSTSCRIPT_EXT = ['.pdf', '.eps', '.ai']
   Document::IMAGE_EXT = ['.bmp', '.gif', '.jpg', '.jpeg', '.png', '.tga']