If you asked me yesterday after Yahoo's total index size announcement (web, images, audio databases) what I would be posting today I would have said that Google would post a new total size to one or more of their databases. I would have been correct.
Google has now posted a new total image size count on the Google Images home page.
The new total listed is 2,187,212,422 up from 1,305,093,600. Yes, that's nearly double. In yesterday's announcement Yahoo said their image database currently contains 1.6 billion images.
Remember, Yahoo and Google's numbers are just claims and they're mire about bragging rights and for keeping the buzz going especially in the non-search community. Many other factors (relevance, freshness, etc.) are what really matter.