In photography, a merger happens when an object in the backdrop is exactly in front of or behind the subject. If there are many subjects in the photograph, a merger can also occur if the two primary subjects overlap or touch the frame’s edges.
A merger may cause the background object to detract from the image’s primary subject or else damage an otherwise flawless photograph. In photography, an example of merging is a tree growing out of the subject’s head due to a poor angle. To prevent collisions, photographers must pay attention to the entire frame and modify angles as needed.