Manipulating the image
The photojournalist generally responds to a situation, whereas the studio photographer creates a situation to fit a pre-conceived image. The ultimate control that the photographer has is the manipulation of the image itself. At its most sophisticated, the photographer can take on the role of an director. By combining studio techniques with photo-composites and re-touching, for example, you can achieve the graphic freedom of an illustration yet retain the basic realism of photographic images. Sophisticated image manipulation such as this is found mainly in advertising, where the commercial results justify the often high cost and lengthy technical work.
Combining images: by Sandwiching, Projection, and Multiple exposure