Research

Matching on action editing

Matching on action or cutting on action refers to film editing and video editing techniques where the editor cuts from one shot to another view that matches the first shot's action. Although the two shots may have actually been shot hours apart from each other, matching on action gives a sense of continuous time when watching the edited film. By having a subject begin an action in one shot and follow it through to completion in the next, the editor creates a visual bridge, which distracts the viewer from noticing the cut or noticing any slight continuity error between the two shots.
An alternative of matching on action is a cut in which the subject exits the frame in the first shot and then enters the frame in the following shot. The entrance in the second shot has to match the screen direction and motive rhythm of the exit in the first shot.

180 degree rule

In film making, the 180-degree rule is a basic rule regarding the on-screen spatial relationship between a character and another character or object within a scene. An imaginary line called the axis connects the characters, and by keeping the camera on one side of this axis for every shot in the scene, the first character is always camera right of the second character, who is then always camera left of the first. The camera passing over the axis is called jumping the line or crossing the line.