Continuity editing

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Continuity editing is the predominant style of editing in narrative cinema and television. The purpose of continuity editing is to smooth over the inherent discontinuity of the editing process and to establish a logical coherence between shots.

In most films, logical coherence is achieved by cutting to continuity, which emphasizes smooth transition of time and space. However, some films incorporate cutting to continuity into a more complex classical cutting technique, one which also tries to show psychological continuity of shots. The radical montage technique relies on symbolic association of ideas between shots rather than association of simple physical action for its continuity.

[edit] Common techniques of continuity editing

Continuity editing can be divided into two categories: temporal continuity and spatial continuity. Within each category, specific techniques can either promote or work against a sense of continuity. In other words, techniques can cause a passage to be continuous, giving the viewer a concrete physical narration to follow, or discontinuous, causing viewer disorientation, pondering, or even subliminal interpretation or reaction, as in the montage style.

The important ways to preserve temporal continuity are avoiding the ellipsis, using continuous diegetic sound, and utilizing the match on action technique. An ellipsis is an apparent break in natural time continuity as it is implied in the film's story. The simplest way to maintain temporal continuity is to shoot and use all action involved in the story's supposed duration whether it be pertinent or not. It would also be necessary to shoot the whole film in one take in order to keep from having to edit together different shots, causing the viewer's temporal disorientation. However in a story which is to occupy many hours, days, or years, a viewer would have to spend too long watching the film. So although in many cases the ellipsis would prove necessary, elimination of it altogether would best preserve any film's temporal continuity.

Diegetic sound is that which is to have actually occurred within the story during the action being viewed. It is sound that comes from within the narrative world of a film (including off-screen sound). Continuous diegetic sound helps to smooth temporally questionable cuts by overlapping the shots. Here the logic is that if a sonic occurrence within the action of the scene has no breaks in time, then it would be impossible for the scene and its corresponding visuals to be anything but temporally continuous.

The match on action technique can preserve temporal continuity where there is a uniform, unrepeated physical motion or change within a passage. A match on action is when some action occurring before the temporally questionable cut is picked up where the cut left it by the shot immediately following. For example, a shot of someone tossing a ball can be edited to show two different views, while maintaining temporal continuity by being sure that the second shot shows the arm of the subject in the same stage of its motion as it was left when cutting from the first shot.

Temporal discontinuity can be expressed by the deliberate use of ellipses. Cutting techniques useful in showing the nature of the specific ellipses are the dissolve and the fade. Other editing styles can show a reversal of time or even an abandonment of it altogether. These are the flashback and the montage techniques, respectively.

By use of the dissolve and the fade, one can show the relative duration of ellipses. A fade-out is a gradual transformation of an image to black; whereas a fade-in is the opposite. A dissolve is a simultaneous fade-out of the shot being cut from, and fade-in of the shot being cut to. The dissolve can be said to show a short ellipsis; whereas a fade-out means a long one.

The flashback is a reversal of time within a story, or more accurately, a window through which the viewer can see what happened at a time before the time considered to be the story present. A flashback makes its time-frame evident only through the scene's action. For example, if after viewing a grown man in the story present, a cut to a young boy being addressed by the man's name occurs, the viewer can assume that the young boy scene depicts a time previous to the story present. The young boy scene would be a flashback.

The montage technique is one that implies no real temporal continuity whatsoever. Montage is achieved with a collection of symbolically related images, cut together in a way that suggests psychological relationships rather a temporal continuum.

Just as important as temporal continuity to overall continuity of a film is spatial continuity. And like temporal continuity, it can be achieved a number of ways: the establishing shot, the 180 degree rule, the eyeline match, and match on action.

The establishing shot is one that provides a view of all the space in which the action is occurring. Its theory is that it is difficult for a viewer to become disoriented when all the story space is presented before him. The establishing shot can be used at any time as a reestablishing shot. This might be necessary when a complex sequence of cuts may have served to disorient the viewer.

One way of preventing viewer disorientation in editing is to adhere to the 180 degree rule. The rule prevents the camera from crossing the imaginary line connecting the subjects of the shot. Another method is the eyeline match. When shooting a human subject, he or she can look towards the next subject to be cut to, thereby using the former's self as a reference for the viewer to use while locating the new subject within the set.

With the establishing shot, 180 degree rule, eyeline match, and the previously discussed match on action, spatial continuity is attainable; however, if wishing to convey a disjointed space, or spatial discontinuity, aside from purposefully contradicting the continuity tools, one can take advantage of crosscutting and the jump cut.

Cross-cutting is a technique which conveys an undeniable spatial discontinuity. It can be achieved by cutting back and forth between shots of spatially unrelated places. In these cases, the viewer will understand clearly that the places are supposed to be separate and parallel. So in that sense, the viewer may not become particularly disoriented, but under the principle of spatial continuity editing, crosscutting is considered a technique of spatial discontinuity.

The jump cut is undoubtedly a device of disorientation. The jump cut is a cut between two shots that are so similar that a noticeable jump in the image occurs. The 30 degree rule was formulated for the purpose of eliminating jump cuts. The 30 degree rule requires that no edit should join two shots whose camera viewpoints are less than 30 degrees from one another.