The hologram records an infinite number of views of the object, whereas a photograph records only one view. Thus, when viewing a hologram, the left eye sees a different set of information than the right eye so that the image appears three dimensional.
Unlike photograph, hologram cannot be reduced or enlarged. Hologram made from 3 dimensional models are recorded in identical size as the original object and the image size cannot be changed. Whereas computer generated holograms can be reduced or enlarged; stereogram holography which is created on computer from movie footage, can be varied in size