Cannot access image site(IIS) directly

I am talking about IIS and ASP.NET application. Currently I decide to create one web applicatio开发者_Python百科n in one site (http://domain.com) and another one site for keeping images (http://images.domain.com). After a little work, I found the problem of accessing the path for creating the images from web application site to image site. One solution that is appeared on my thought is using Web Service. But I still want to hear if there are other solution for solving this problem from you guys?

A few options, most of them applicable if both sites are on the same computer, or even on the same network domain :

1. Give the windows user that acts as the identity of the main site's application pool, access permissions to the Images' site folder.

2. use Impersonation to access the other images' site folders with the right permissions.

3. Another option is to have both sites run as the same windows user

other then that, haveing a web service to push files to the Images site is a great and scalable solution.