For instance each user will have his own directory , so how I give him a privacy that only he would have a permission to view files in that directory (of course after that he is registered user)?
By not giving him direct access to the files. Use URLs like: 
http://www.example.com/image/12345

[download]
and map the 12345 to a specific image for the user. Apache can do URL rewriting, and so can many frame works. Just don't turn them into redirects. You'd use a database to map the tuple (user, number) to a file path.

In reply to Re: Where to store images? by JavaFan
in thread Where to store images? by AlfaProject

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