I am designing a photo gallery site where every picture page has a link for a high resolution version of the picture intended for printing, but I found out that people are simply clicking 'save as...' on the low-res version that gets displayed and printing that instead. The printed pictures come out fairly usable but could be much better if the high-res version was used instead.
What are some good ideas for preventing non-techie users from printing the low-res version that is intended for screen usage only?
