Well, when we consider how we actually look for images on the web, the reason why it is hard to find them quickly becomes apparent. If these terms have not been applied or added to a record describing the image, we cannot find them. Most pictures have file names that are rather cryptic such as blufoot.jpg or ampag.gif. Search utilities with databases of cataloged images are the most reliable way to search for images .
Humans assign descriptive terms of picture elements, style, content and subject.
Pictures containing your search terms are retrieved based on the indexed terms. Specialized sites often have images arranged by categories with a variable amount of accompanying data. A collection of images of art, architectural and museum objects from the University of Michigan History of Art Department, the Kelsey Museum of Archaeology, the University of Michigan Museum of Art and Chicano Murals located in Los Angeles. Large range of searchable databases.