In google analytics, I can see more visitors visit my site via image.google.com But I don't know how to specify which keywords visitors typed on google image search box? Thanks!
use a tracker, like extreme tracker and you will find out which keyword you're getting for image search
In google webmaster tools, under statistics, look at the Top Search Queries page. At the bottom there's a link that says 'download all query stats' Download it nad you'll get a huge file that will do just that.
Correct, don't think Analytics shows keywords for Google Image results, only regular organic google results.
Dude use Haveamint Google analytics is crap, it doesn't even show the correct referral address most times. Why does everyone have to have everything Google does?
If you using a fresh image with that image alt tag, it will come thorough search engines by that keyword which is in your alt tag.