improve rmagick feature of rfpdf plugin for PDF inline images (#3261)

Contributed by Jun NAITOH.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7806 e93f8b46-1217-0410-a6f0-8f06a7374b81

vendor/plugins/rfpdf/lib/core/rmagick.rb

@@ -57,6 +57,11 @@ module RFPDF
     end
 
     out['bits'] = image.channel_depth
+    File.open( TCPDF.k_path_cache + File::basename(filename), 'w'){|f|
+      f.binmode
+      f.print image.to_blob
+      f.close
+    }
     
     out
   end