OK, this one is a bit tricky; see, I have one website which gets around 70% visits from google image search, where visitors go directly to image in most cases. Since I love to experiment; I thought of being creative and produced with certain effort nice cute script. Currently, when user loads: http://domain.com/image.jpg in browser; I can make it show image plus adsense and html if needed. So basically I turn every direct image into possible revenue hit. No black hat or any intention from me to force people to click, but as this 70% makes more than 500 visits per day virtually useless in terms of site revenue I thought of this to see what happens. Only thing that bothers me, has anyone got some solid reason for me not to use this? Perhaps a past experience case or solid arguments? Cause, now it took me 1 week to write this and test it, and I find it cool, but google might not. Can I send mail to google anywhere to ask?
I would make sure there is some sort of textual content with the image, if you are placing an ad only with an image, it would be against TOS. Make sure there is something contextual on that page and you wont have a problem.
Its an interesting one, I agree that you may need some text content. I came across something similar where people downloaded images from a website and they displayed Adsense when uploaded to another site. They had Google's permission to do it. Maybe posting this question on the official Adsense forum would attract a Google employee.
Yes definitely make sure with Google because if you find that they do not actually allow this to happen (which I do not see why they wouldn't) then they may remove you altogether and that probably would not be for the best.