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hutcheson - 11:19 pm on Jul 24, 2008 (gmt 0)
I suspect that a good 1-sentence summary of the article associated with a picture would also make a good meta tag for the picture, whether it's (to invent some WWII newsreel-type headlines) "Adolf Hitler visits rocket factory in Denmark" or "HMS Victorious sinks after torpedo attack in the Bight of Biscay" or "Aachen Cathedral on fire after tank battle" -- object, action, location, occasion. I shouldn't wonder if that kind of summary (as, say, an H3-level heading CSS'ed down to a bold-font lead paragraph) wouldn't benefit news pages also. The point is, it really isn't much work, for someone who's used to churning out columns of news text. It's just a slightly different way of thinking about a kind of work you're probably doing already.
Google doesn't care whether the website is about news or stock photos. The indexing scheme works the same in either case.