1. A photographic system for generating photos, comprising: a photo composition unit capable of selecting an extracted view from a plurality of virtual views in a three dimensional (3D) scene; and a photo synthesizer, coupled to the photo composition unit, capable of synthesizing an output photo according to the extracted view; wherein, the 3D scene is a 3D virtual space based on at least two input images; wherein the photo composition unit is further capable of selecting the extracted view according to at least one photographic composition rule, at least one exemplar parameter, or a combination thereof.