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What I'm thinking is that there's some kind of percentage factor in search engine algorithms. That is, if there's a page with one word on it, its "keyword percentage" for that word is 100%. If the page has the keyword on it plus a bunch of other text, the percentage goes down according to how much other text there is. The higher the percentage (what algorithm thinks the page is "about" compared to other pages on the web), the higher your listing in search results.
This is the only way I can explain my rankings compared to other sites that have been around longer but which I presume have a lot more "extraneous" text (off-keyword text) than my pages.
Comments? I don't know that much about search engine algorithms but this is really stumping me.
i've been tempted to try a similar "test" to see if i can duplicate the results but have not. i can't believe it has been up there in the serps for well over a year.
It is my understanding that one should keep their keyword density between 2% and 7%. This is very hard to do on a text heavy page.
However on one site already well ranked by Google I had a portfolio with a major keyword (and also very popular) ranking #45 in Google and I was able to bring it up to #24 by reducing the amount of text on the page--just a few lines of major keywords under each picture (focusing on the one I needed for that page). I put all other info in small pages they needed to click on it they wanted that extra info, i.e., with a javascript onclick it opens a new small window.
So I would say, Yes, include a description under your images but use your main keywords for that particular page, i.e., if the page focuses on blue widgets then make sure this is the keywords under those pictures, in various spellings and arrangements.