What is the best format for photographic color images? What are the techniques called that shrink the sizes of movies? What is the technique in which an application supports only a certain number of...

What is the best format for photographic color images? What are the techniques called that shrink the sizes of movies? What is the technique in which an application supports only a certain number of specific colors, creating a palette from which to choose? What is the format that describes an image in terms of lines and geometric shapes?