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If you're that keen on increasing the prominence of a particular image, it may be worth making sure you have an appropriate alt tag and that any text surrounding the image correlates with this.
There's a little more info here [google.com]
The file name eg "widgets.jpg" and the alt tag appear to be the most important factors with regards to indexing.
Belt and braces would dictate that you use title tags and relevant copy as well, but I find that file name and alt tag should do the job for you in most cases
Instead, I think images for the google image index are only taken in by the image bot. And since the image bot seems to take its time in finding sites (it was 4 months before the image bot found mine), it may take a while for the images to get put into the index.
The image bot first grabbed some of my pictures back in mid to late December, so maybe they will start showing up in February or so.
Just my two cents.
a) a quality appropriate filename.
b) if possible, the title of the page should match the kw.
c) if possible link text pointing at the page should match the kw.
d) that the image is not blocked by some referrer blocking scheme.
e) that the image uses a standard <img src=> tag (js will not work)
f) the page has as high a pr as possible (well duh).
g) use a quality alt attribute with the kw in the img tag.
h) use a quality TITLE attribute with the img tag.
i dont use much images for site design this may be one point
all may pictures appear only once
only one larger picture per page
my sites rank high for those search terms, no imagename, no alt-tags
delish on that :)
- google divides pagerank through number of pics
- often used pics (navelements) are discared before or after
- results are mixed with different scoring rules (serps, alt-tags, img-names etc.)
the last guess i sometimes think to notice on normal google-serps. (mixed pageranks, domain-influences, etc.)
Then, tonight, while searching again, none of my images were listed!
Seems like Google Image may also have some sort of a fresh bot going around, or at least a Google Image update is now occuring, since images are listed at one time and not at another time.
I just don't get it. The other pictures *are* in there. I can find them by searching on my domain name, but what makes one of them a #1 candidate and the others not worth showing, I can't guess.