At present we use the American platform, Lexis.com, to run searches for press articles worldwide. When articles are put on Lexis, they don't come with their original images, eg a newspaper article may have a picture or several pictures, often with captions. These actual photographic images do not show up on Lexis - but the caption does, along with the word 'graphic'. I was asked if it was possible to search by image on Lexis.com - so we were looking for articles that had contained a photograph of a particular item. Initially I didn't think it would be possible - but it turns out that you can run a 'graphic' search, where Lexis will search the captions that accompanied the various images that were in the original article. The fee-earner was delighted, and even though we would need to resort to obtaining original copies of the article if we want to actually see the image being referred to, the fact that we could identify articles with this particular image was a great start.
I have to admit, I do love it when I learn something new like this!!
Image courtesy of: http://www.freedigitalphotos.net/images/view_photog.php?photogid=1152