Map of dermatology: web image browser for differential diagnosis in dermatology.

The Web has very rapidly evolved over the last decade, from a mostly text-based information channel to a powerful multimedia-publishing medium rivalling traditional print media. Most internet search engines have matched this evolution of the Web from text to multimedia by developing their own dedicated image search tools and interfaces, and there are even some search engines that specialize only in image searching. Examples of image search engines on the Web include Cydral, Ditto Image Search, Google Image Search, Picsearch, and Yahoo Image Search. Google Image Search is the most effective image search engine, with the broadest index/coverage of images from the Web among all surveyed engines.