1. A method automatically compressing images comprising: (a) ranking images within said clusters based upon image emphasis, wherein said ranking includes: (1) computing one or more quantities related to one or more features in each image, said features including a content of said images; (2) processing said quantities with a reasoning algorithm that is trained based on opinions of one or more human observers; and (3) applying said quantities to said images to produce said ranking; and (b) variably compressing said images depending upon said ranking.