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Does it work on the same principles as a regular search on Google, or is there more to it, like ALT text, image file names, folder names, etc. that can help make pages and the images therein perform well in Google image search.
Is there much in the way of solid research out there that examines how placement works in the Google image search?
Almost a thousand people have now emptied their hearts on the effects of Allegra, but hardly anyone realized how much progress google has made on showing images with just this same update. I guess we might gain significant insights into the new algos if we put 20% attention to this branch.
Although I'm quite satisfied with the results and really do wonder how google has identified exactly this one most beautiful image of all my widgets on a search on simply widget, I don't have the faintest idea how the algo worked.
I was trying to figure it ouw a little while ago, and when I did an image search on [blue heron] the first image that came up was greatblue.jpg (no heron) and the alt text had a different bird's name (an obvious cut and paste error.
But they page that the images were on were very definitely about great blue herons, so they were getting the information from elsewhere on the page.
I would go to the effort to associate the words in nearby code blocks, and limit the range of information that is on the page that relates to other topics.
As it is, on my biggest site, Google Images is my #3 SE, and it is closing in on Yahoo!. It is providing about 3 times the traffic as MSN.
since two years ago I dived a bit into jpeg-encoding I'd love to see more on that. do you have any urls at hand? I cannot imagine google is on the way to automate gestalt-theory, so if there are any means by which I can support search engines to identify my pictures I'd surely do.
On the other hand I'm convinced that there is far more to this than what was said above: I have seven pictures of widgets (out of about 30 pictures total) on my main-page. Seven have widget + color + a few other denominators as alt-text, the seventh has a completely different name, even one I feared to fall into a bad-neighbourhood-trap because of one of its secondary meanings.
Google has picked the seventh, which I found quite amazing. The only visible difference is its size and quality. Another diffenrence occurs, because all seven pictures are embedded into an a-href-sequence. Do you think the latter matters?
My site is very graphic intensive, and I've noticed that Images don't update too often.
My page ranks well, but not my images.
The title page routinely has the same words as the image filename, with matching alt tag.
Maybe my graphics are in the sand box, who knows?
Pretty odd, it's also a small picture.