I do not believe this is possible, but I figure there are people out there way smarter than me, so why not check ..
I would like to have an HTTP image that is viewable from within a page when used w/in an img tag, but NOT visible if the img src link is called directly. Does that make sense? Viewable in page, but not if called directly.
Quick edit .. acceptable alternative is to embed image in page in such a way as url is not human readable / able to be extracted and typed into browser.
Update 2 ... .NET IIS7 env.