A composite Image is a picture that is made from the combination of multiple images merged into a single surface. One of the main advantages to Adobe Photoshop is its ability to overlay multiple images onto a single surface to create a composite. Designers often employ the technique when placing incongruous images in the same environment to create a surreal effect. Composites can also be made from different versions of the same photograph. For example, if you have two shots of the same landscape at the same angle, but at different times of day, you can make a composite to blend the two together, highlighting your favorite aspects of each.
Compositing or photo compositing is the technique art and craft of combining images to create a new image. The newly created image often presents its own version of reality. Compositing is often used in advertising, where the use of the technique is sometimes intended to be obvious and at other times is designed to be seamless. Compositing has sometimes been used in journalism, although this use is generally frowned upon when discovered.
Compositing is one of the hottest trends in Photoshop and photography today for portrait photographers, designers of all walks of life, and even retouchers. Everywhere you look, from group photos, to school graduation portraits or sports portraits, to magazines, movie posters, and DVD covers, chances are, you've seen compositing.