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I'm not real sure if I understand you question, but I think I do.
There are only a few ways that a search engine can rank an image off of information that it gets from you page. The alt and title attributes are one way. The image name too. Perhaps links to the image are counted like IBL's? Context. Plus, it's possible, but I'm not sure, that the search engines view the file header and use that information to rank images. Really, the se's don't have much to go off of, considering they can't view the real content at hand. I think that's why Google implemented Enhanced Image Search, to try to put a human element into the ranking of content unviewable by the bots.
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