In a newly released webmaster help video, The Spam King, Matt Cutts answers a question about image search.
The question was asked, "Does Google use EXIF data from pictures as a ranking factor?"
Matt says Google reserves the right to use EXIF (Exchangeable Image File Format) data in order to help people find information about an image. In a previous version of image search, Google used to show this information in a sidebar when it was available.
He reconfirming that it is not currently a ranking factor but could be in the future. Google reserves the right to use this information in ranking as well. Matt adds you shouldn’t worry about adding EXIF data if it’s not there already.