Forum Moderators: open
Does Googlebot swing by my site, see only the one image change and think that I never really update the site? Am I, a guy who is providing relevant and fresh content for my target audience every day, being penalized in Google searches because my content consists of just one image?
I think this wopuld be a relevant discussion
Are you using If Modified Since? [webmasterworld.com]
The if modified since date would not change on the page so therefore, if the bot is using this to determine if content is changed, it would not consider that page "fresh".