Relationship of the frame’s width to its height
The most common aspect ratios used today in the presentation of films in movie theaters are 1.85:1 (Academy standard) and 2.39:1 (anamorphic widescreen). Two common TV aspect ratios are 4:3 (1.33:1), universal for standard formats, and 16:9 (1.78:1), universal to high-definition formats.

Continuity Editing
A system of cutting to maintain continuous and clear narrative action. Continuity editing relies on matching screen direction, position, and temporal relations from shot to shot.
Includes, but is not limited to, the axis of action, shot-reverse-shot, the eyeline match shot, and cross-cutting.
Shot-reverse-shot
Two or more shots edited together that alternate between characters, typically in a conversation situation; over-the-shoulder framings are common.
Crosscutting
Editing that alternates shots of two or more lines of action occurring in different places, usually simultaneously.
Montage
A synonym for editing; emphasizes dynamic, often discontinuous relationships between shots and the juxtaposition of images to create ideas not present in either shot by itself.
Montage Sequence
A segment of a film that summarizes a topic or compresses a passage of time into brief symbolic or typical images; frequently, dissolves, fades, superimpositions, and wipes are used to link the images in a montage sequence.
Jump Cut
An elliptical cut that appears to be an interruption of a single shot. Either the figures seem to change instantly against a constant background, or the background changes instantly while the figure remain constant.
Superimposition
The exposure of more than one image on the same film strip or in the same shot.

Diegesis
In a narrative film, the world of the film’s story. The diegesis includes events that are presumed to have occurred and actions and spaces not shown onscreen.
Diegetic Sound
Any voice, musical passage, or sound effect presenting as originating from a source within the film’s world.
Nondiegetic Sound
Sound, such as mood music or a narrator’s commentary, represented as coming from a source outside the space of the narrative.
External Diegetic Sound
Sound represented as coming from a physical source within the story space that we assume characters in the scene also hear
Internal Diegetic Sound
Sound represented as coming from the mind of a character within the story space; although we and the character can hear it, we assume that the other characters cannot
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On the significance of editing:
10 re-cut movie trailers
The Shining, recut












