Cinema Perspective

Cinema Perspective is the capture, recording, processing, projection, display and viewing of moving perspective images. It extends Camera and Photographic Perspective by adding time, movement, changing viewpoint, image sequencing, large-scale projection and the possibility of immersive spatial experience.

A cinema image is therefore not merely a photograph that moves. Cinema can continuously transform the viewer’s relationship with represented space through camera movement, object movement, changing focal length, framing, editing, stereoscopy, wide-field projection, panoramic displays, computer-generated imagery and visual effects.

The complete cinema perspective process may be expressed as:

Physical or Artificial Scene → Cinema Camera → Moving Perspective Images → Recording / Processing / Editing → Projection or Display → Cinema Screen → Spectator → Visual Perception.

Because several perspective processes occur sequentially, cinema provides one of the clearest examples of Perspective Category Chaining.

What Is Cinema Perspective?

The Dictionary of Perspective defines Cinema Perspective as a type of camera, photographic and instrument perspective used to capture and subsequently project cinematic or other large-scale moving images to an audience.

Related forms include:

  • Camera Perspective;
  • Photographic Perspective;
  • Motion Perspective;
  • Stereoscopic Cinema;
  • Wide-Field Cinema;
  • Anamorphic Cinema;
  • Panoramic Cinema;
  • 3D Cinema;
  • Digital Cinema;
  • Animated Perspective;
  • Computer-Generated Cinema; and
  • Immersive Cinema.

Cinema Perspective is therefore a broad family of related imaging, projection and viewing processes rather than one single geometrical projection method.

Cinema as Moving Photographic Perspective

Cinema developed from photography but greatly expanded its perspectival possibilities.

A conventional photograph normally records one perspective image at one moment from one selected camera position and viewing direction.

Cinema instead records or generates a sequence of images through time.

This allows spatial relationships to change continuously as:

  • objects move;
  • people move;
  • the camera moves;
  • the camera rotates;
  • the viewing direction changes;
  • the field of view changes;
  • focus changes;
  • the represented scene changes; or
  • one viewpoint is replaced by another through editing.

Cinema therefore introduces temporal perspective transformation into the photographic image.

Cinema and the Dimension of Time

One of cinema’s fundamental extensions of perspective is the inclusion of time.

A spatial scene may change from frame to frame. The observer can therefore see transformations that a single still image cannot fully communicate.

These can include:

  • movement through depth;
  • changing object scale;
  • changing aspect;
  • changing occlusion;
  • motion parallax;
  • changing surface visibility;
  • changing viewpoint;
  • rotation;
  • changing illumination; and
  • continuous changes in relative spatial position.

Moving images therefore provide additional spatial information unavailable within one isolated frame.

From Cinema Camera to Cinema Screen

Cinema involves two major instrumental stages:

  1. Image capture — a cinema camera forms and records moving images.
  2. Image projection or display — those images are subsequently enlarged or displayed for an audience.

In traditional film cinema the process is:

Scene → Camera Lens → Film Image → Film Projector → Cinema Screen → Spectator.

In digital cinema it becomes:

Scene → Digital Camera → Electronic Image Data → Digital Processing / Storage → Digital Projector or Display → Spectator.

The image therefore passes through several physical, optical, instrumental, graphical or computational spaces before reaching the human visual system.

Cinema as Perspective Category Chaining

Cinema is especially important within Perspective Category Theory because one film may involve several Perspective Categories operating sequentially or simultaneously.

A relatively simple live-action cinema chain can be written as:

Natural Scene → Optical Perspective → Instrument Perspective → Photographic / Digital Image → Instrument Projection → Visual Perspective Type 2.

A modern effects-heavy production can be considerably more complex:

Physical Scene → Camera Capture → Digital Processing → CGI / New Media Perspective → Composite Image → Digital Projection → Cinema Screen → Human Visual Perception.

The final film image can therefore contain spatial information derived from several different sources and methods.

The Cinema Screen as a Window onto Another Space

Volume 1 describes one of cinema’s fundamental spatial paradoxes: an image projected onto an interior theatre screen can appear to act as a window onto another spatial world.

The spectator is physically located within the cinema auditorium, yet visually attends to a represented world that may depict a completely different place, scale, time or reality.

Two spatial environments therefore coexist:

  • Physical cinema space — audience, theatre and screen;
  • represented filmic space — the spatial world appearing within or beyond the screen.

When the cinematic illusion is convincing, attention can shift so strongly towards the represented space that the physical theatre becomes perceptually secondary.

Camera Perspective in Cinema

The cinema camera is a perspective instrument.

A lens-based camera forms a two-dimensional optical image of a three-dimensional scene upon film or an electronic sensor.

The resulting perspective depends upon several factors, especially:

  • camera position;
  • viewing direction;
  • orientation;
  • lens focal length;
  • film or sensor format;
  • field of view;
  • focus;
  • aperture;
  • lens design; and
  • movement of the camera during the shot.

These variables determine or modify different aspects of the cinematic image and should not be collapsed into one general concept of “camera perspective”.

Viewpoint and Projection Centre

For a conventional central camera image, the principal geometrical perspective relationship is determined by the camera viewpoint or effective projection centre.

The camera records the scene from a particular spatial position and direction.

Changing that camera position changes the projected relationships between objects.

These changes can include:

  • relative apparent size;
  • relative position;
  • overlap;
  • parallax;
  • object aspect;
  • visible and hidden surfaces;
  • vanishing-point positions; and
  • the spatial relationship between foreground and background.

Camera position is therefore one of the most fundamental controls of Cinema Perspective.

Moving Camera Perspective

When the cinema camera physically changes position, the station point or projection centre changes.

The perspective image consequently changes continuously.

A moving camera can produce:

  • changing vanishing relationships;
  • motion parallax;
  • changing apparent scale;
  • changing object aspect;
  • changing occlusion;
  • changing foreground-background relationships; and
  • continuous transformations of spatial form.

This is one of the principal forms of Motion Perspective.

Pan, Tilt and Camera Rotation

The camera does not have to translate through space for Cinema Perspective to change.

It can also rotate while remaining substantially at the same position.

  • Pan — rotates the camera horizontally.
  • Tilt — rotates the camera upwards or downwards.
  • Roll or Dutch-angle rotation — rotates the image frame about the viewing axis.

A pan or tilt changes the viewing direction while the camera station point remains substantially fixed.

This should be distinguished from translation, in which the camera itself moves to a new spatial position.

Dolly and Tracking Perspective

A Dolly Shot translates the camera through physical space.

The camera may move:

  • towards the subject;
  • away from the subject;
  • laterally;
  • diagonally; or
  • along another planned path.

Because the projection centre itself moves, a dolly or tracking movement changes actual perspective relationships within the image.

Nearer and farther objects shift relative to one another, producing motion parallax and changes in apparent spatial depth.

This distinguishes a true moving-camera shot from a simple optical zoom.

Zoom Perspective

A Zoom Shot changes lens focal length while the camera position remains fixed.

This alters:

  • field of view;
  • image magnification;
  • framing; and
  • the amount of the scene included within the image.

However, because the viewpoint remains fixed, a simple lens zoom does not produce the same geometrical perspective change as physically moving the camera.

This distinction is fundamental:

Zoom = change of focal length and field of view.

Dolly = change of camera position and therefore viewpoint geometry.

The Dolly Zoom or Hitchcock Zoom

The Dolly Zoom, also known as the Hitchcock Zoom, Vertigo Effect or Zolly, combines these two processes.

The camera moves towards or away from a subject while the lens zooms in the opposite direction.

The image can be adjusted so that the main subject remains approximately the same size within the frame while the background perspective appears to expand or compress dramatically.

The technique makes especially clear the difference between:

  • changing viewpoint geometry; and
  • changing image scale and field of view.

Cinema can deliberately coordinate both transformations to produce striking spatial effects.

High-Angle and Low-Angle Cinema Perspective

Camera height and orientation strongly affect the perspective form of a cinematic image.

  • High-Angle Shot — the camera is positioned above the subject and looks downward.
  • Low-Angle Shot — the camera is positioned below the subject and looks upward.
  • Overhead or Bird’s-Eye View — an extreme high-angle view approaching a direct view from above.
  • Worm’s-Eye View — an extreme low viewpoint directed strongly upwards.

These are not merely compositional choices. They alter object aspect, visible surfaces, line convergence and the organisation of image space.

Volume 1 notes, for example, that Orson Welles used low- and high-angle shots and long shots in Citizen Kane to intensify the impression of deep and cavernous space.

Cinema Perspective and Field of View

Field of View is one of the principal variables in Cinema Perspective.

It determines how much of the target scene is included within the captured image.

For a particular film or sensor format, changing focal length changes the camera’s angular field:

  • shorter focal lengths normally capture wider fields;
  • longer focal lengths normally capture narrower fields.

But the field captured by the camera should be distinguished from the apparent field occupied by the displayed image for the spectator.

A small image viewed from far away occupies relatively little of the spectator’s visual field, whereas a very large screen viewed from closer range can produce a much more expansive and immersive visual experience.

Captured Field versus Presented Field

Cinema therefore involves at least two important field-of-view relationships.

  • Captured or target-space field of view — the angular portion of the original scene recorded by the camera or rendering system.
  • Presented or local-space field of view — the angular size of the displayed image as seen by the cinema spectator.

The second depends strongly upon:

  • screen size;
  • screen shape;
  • spectator distance;
  • spectator position; and
  • how much of the viewer’s visual field the screen occupies.

Large-format and wide-screen cinema systems have repeatedly attempted to increase this presented visual field and thereby increase the impression of immersion.

Widescreen Cinema Perspective

Widescreen Cinema presents an image with a width substantially greater than its height.

Modern widescreen systems became especially important during the twentieth century as filmmakers attempted to occupy more of the audience’s horizontal visual field.

Different methods were developed to achieve a wider cinema image, including:

  • anamorphic optical compression;
  • larger film gauges;
  • alternative film orientation;
  • multiple-camera systems;
  • multiple projectors;
  • curved screens;
  • large-format projection; and
  • digital wide-field displays.

These systems share a general goal but use different perspective and imaging arrangements.

Anamorphic Cinema Perspective

Anamorphic Cinema uses a specialised optical transformation to capture a wide horizontal field within a narrower recording format.

An anamorphic camera lens compresses the horizontal image during capture. A corresponding optical or digital operation later expands it for widescreen presentation.

The process is:

Wide Scene → Horizontal Optical Compression → Recorded Image → Horizontal Expansion → Widescreen Cinema Image.

Classic anamorphic cinema therefore demonstrates how an image can be deliberately transformed at one stage of the cinematic chain and restored at another.

CinemaScope

CinemaScope became one of the best-known widescreen applications of Anamorphic Perspective.

A wide image was compressed optically onto a standard film format and subsequently expanded when projected.

The system illustrates an important principle of Cinema Perspective:

the geometry of the captured image does not necessarily have to be identical to the geometry of the image finally displayed to the audience.

Intermediate transformations can be deliberately incorporated into the imaging chain.

Cinerama

Cinerama pursued wide-field immersion through a very different method.

The original system used three synchronised 35 mm projectors to display a very wide image across a deeply curved screen.

The combined screen subtended approximately 146 degrees and was intended to occupy a much larger portion of the spectator’s visual field than an ordinary cinema image.

Cinerama therefore combined:

  • wide-field capture;
  • multiple image components;
  • multiple projection channels;
  • a curved display surface; and
  • large-scale visual immersion.

It provides an important historical example of cinema extending towards panoramic and cylindrical perspective.

VistaVision

VistaVision demonstrates that widescreen cinema does not necessarily require anamorphic optics.

The system used 35 mm film in a different orientation and exposed a larger negative area, providing increased image resolution and a wide cinema format without using the characteristic anamorphic squeeze.

VistaVision therefore represents another solution to the general Cinema Perspective problem of combining:

  • wide image coverage;
  • high image quality;
  • adequate resolution; and
  • large-scale projection.

65 mm and 70 mm Cinema

Larger film formats provide another route to large, detailed and wide cinematic images.

Volume 1 discusses 65/70 mm cinema as a high-resolution film system capable of preserving substantial image detail while supporting wide-field projection.

Anamorphic optics can also be combined with these larger formats to produce exceptionally wide images.

Thus the width and apparent scale of a cinema image depend upon the complete combination of:

  • lens;
  • film or sensor format;
  • aspect ratio;
  • projection system;
  • screen dimensions; and
  • audience viewing distance.

Stereoscopic Cinema Perspective

Stereoscopic Cinema adds binocular perspective information to the moving image.

Two related views of a scene are captured or generated, corresponding broadly to separated left- and right-eye viewpoints.

During presentation, an appropriate system directs one image principally to each eye.

The differences between the two views can generate binocular disparity and contribute to an illusion of three-dimensional solidity.

However, stereoscopic cinema is only one form of Cinema Perspective. Ordinary monocular cinema already communicates powerful 3D information through:

  • perspective diminution;
  • foreshortening;
  • occlusion;
  • texture;
  • motion parallax;
  • changing aspect;
  • lighting;
  • colour;
  • focus; and
  • camera movement.

The Camera Viewpoint and Spectator Viewpoint Problem

One important problem in cinema is that the spectator’s physical viewing position is not necessarily the same as the camera position from which the image was originally captured.

This difference exists in ordinary cinema but becomes especially important in stereoscopic and large-field systems.

The camera establishes one projection geometry while the audience may subsequently observe the screen:

  • from different distances;
  • from different lateral positions;
  • from different heights; and
  • through different angular relationships to the screen.

Volume 1 and the Dictionary of Perspective note that early stereoscopic cinema could produce distorted apparent scale and scene geometry when the spectator relationship did not appropriately match the original camera geometry.

Cinema Perspective therefore depends not only upon how an image is captured but also upon how and where it is subsequently viewed.

3D Cinema Is Not the Same as 3D Perspective

The expression “3D cinema” is commonly used for stereoscopic motion pictures, but 3D Perspective is a much broader concept.

A conventional monocular film already represents three-dimensional object space through a moving two-dimensional image.

Stereoscopic cinema adds binocular disparity, but it does not automatically reproduce every optical and perceptual cue available in natural vision.

It is therefore more precise to distinguish:

  • monocular Cinema Perspective;
  • stereoscopic Cinema Perspective;
  • wide-field Cinema Perspective;
  • multi-view Cinema Perspective; and
  • immersive Cinema Perspective.

Circle-Vision 360°

Circle-Vision 360° extends cinema around the spectator through a circular arrangement of projection screens.

Instead of one frontal screen, the audience is surrounded horizontally by several images.

The system therefore moves towards a form of Cylindrical, Panoramic and 360 Degree Perspective.

The audience can look in different directions around the display, greatly extending the field beyond ordinary frontal cinema.

However, wide directional coverage should not automatically be confused with genuine viewpoint-dependent multi-view imagery. A surrounding image can be multi-directional while remaining based on a fixed or coordinated capture geometry.

Flat, Cylindrical and Spherical Cinema Screens

Cinema images can be displayed using several broad screen geometries.

  • Flat or 2D screen — the conventional cinema-screen arrangement.
  • Cylindrical or strongly curved screen — associated with panoramic systems such as Cinerama and Circle-Vision.
  • Spherical or dome-like screen — associated with dome theatres, OMNIMAX and newer immersive display systems.

The geometry of the physical screen and the geometry of the image projected onto it must be distinguished.

A curved screen does not automatically create a cylindrical or spherical perspective image. The displayed imagery must be generated, transformed or mapped appropriately for the surface and intended observer relationship.

Curved Screens Are Not Automatically Multi-View

Another important distinction concerns Multi-View Perspective.

A large curved cinema screen can be viewed physically from many positions in the auditorium. However, if every spectator sees the same fixed image, the display does not thereby generate a different perspective image for each observer location.

Three situations should be distinguished:

  1. Uni-angular viewing of a uni-angular image — conventional frontal cinema.
  2. Multi-angular physical viewing of one fixed image — observers see the same image from different auditorium locations.
  3. Multi-angular viewing of viewpoint-dependent images — the image itself changes appropriately for different observer positions.

Only the third provides genuinely different image-based perspective information according to spectator position.

IMAX and Large-Format Cinema Perspective

Large-format cinema systems such as IMAX extend Cinema Perspective through large, high-resolution projected images designed to occupy a substantial portion of the spectator’s visual field.

The perspectival effect depends upon the combination of:

  • camera field of view;
  • image resolution;
  • screen size;
  • screen shape;
  • projection quality;
  • audience distance; and
  • viewing position.

A large screen can therefore intensify apparent spatial scale and immersion even when the underlying image remains a conventional perspective projection.

OMNIMAX and Dome Cinema

Dome and spherical cinema systems extend the projected image beyond the ordinary rectangular frontal screen.

The image can extend overhead and across a much wider angular region, thereby approaching a hemispherical or surrounding visual experience.

Specialised wide-field or fisheye capture and projection geometries may be used so that the original image corresponds more closely to the curved display surface.

These systems connect Cinema Perspective with:

  • Spherical Perspective;
  • Panoramic Perspective;
  • Wide-Angle Perspective;
  • Curvilinear Perspective;
  • Sphere of Vision; and
  • Immersive Perspective.

Sphere Theatre and Ultra-Wide Cinema

Recent large-scale display systems extend Cinema Perspective towards extremely wide and surrounding image environments.

Volume 1 discusses the Sphere theatre in Las Vegas as a large immersive display in which ultra-high-resolution imagery is presented across an enormous curved interior screen extending above and around the audience.

Such systems raise several perspective problems simultaneously:

  • wide-field capture;
  • fisheye or curvilinear projection;
  • camera-to-screen geometry;
  • spectator field of view;
  • image resolution;
  • screen curvature;
  • viewer position; and
  • matching the captured image to the presented display field.

The result demonstrates how modern Cinema Perspective increasingly involves the coordination of the entire capture–processing–display–observer system.

Cinema Perspective and Motion Parallax

Motion Parallax is an important source of depth information within moving cinema images.

When the camera translates through a scene, nearer and farther objects move across the image at different apparent rates and directions.

This changing relationship helps communicate:

  • relative depth;
  • separation between objects;
  • spatial scale;
  • camera movement; and
  • the three-dimensional organisation of the scene.

A moving monocular film can therefore provide rich 3D information without stereoscopic presentation.

Object Movement in Cinema Perspective

The camera does not have to move for motion perspective information to occur.

Objects may move relative to a fixed camera.

Their motion can produce:

  • changes of apparent size;
  • changes of position;
  • changes of aspect;
  • occlusion and disocclusion;
  • movement towards or away from the camera;
  • rotation; and
  • changes in relative depth.

Cinema therefore combines Moving-Camera Perspective with Moving-Object Perspective in many possible ways.

Editing and Multiple Viewpoints

Cinema also differs from ordinary visual experience because one represented scene can be shown successively from entirely different camera positions.

An editor may cut between:

  • wide shots;
  • close-ups;
  • high viewpoints;
  • low viewpoints;
  • front views;
  • rear views;
  • moving views; and
  • different focal lengths.

The spectator can therefore experience a sequence of spatial viewpoints that would require substantial physical movement in ordinary reality.

Cinema can consequently produce a temporally sequenced multi-view representation even when each individual frame or shot is based upon one principal camera viewpoint.

Point-of-View Cinema Perspective

A Point-of-View or POV Shot places the camera so that its image approximately represents what a character or participant would see from a particular location.

The audience temporarily adopts the camera’s viewing relationship and can experience the scene as though looking through the character’s position.

This demonstrates cinema’s ability to assign different station points to the spectator without physically moving the cinema audience.

The represented viewpoint can therefore become a narrative and perceptual device as well as a geometrical one.

Cinema Perspective and Apparent Scale

Cinema can radically transform apparent scale.

A tiny physical model can appear to be a city. A human face can fill an enormous screen. A microscopic structure can appear larger than a building, while planets and galaxies can be represented within one image.

This separation between physical object size, recorded image size, projected screen size and perceived scale is one of the major powers of cinematic representation.

Cinema therefore provides a particularly striking example of the distinction between:

  • object scale;
  • projection scale;
  • display scale; and
  • perceived scale.

Forced Perspective in Cinema

Forced Perspective is widely applicable to cinema because the camera can record a deliberately altered physical scene from a carefully selected viewpoint.

Physical dimensions, distances or object positions can be arranged so that the camera image makes them appear different from their actual values.

Possible effects include making:

  • a small model appear enormous;
  • one person appear much larger or smaller than another;
  • a shallow set appear deep;
  • a miniature landscape appear full-scale; or
  • objects at different actual distances appear to interact spatially.

The illusion works because the cinema audience normally sees only the selected camera image rather than the complete physical geometry of the set.

Practical Effects and Physical Perspective

Traditional cinema has used many practical or mechanical effects created physically in front of the camera.

These may include:

  • miniatures;
  • constructed backgrounds;
  • artificial skies;
  • rigging;
  • moving platforms;
  • mechanical sets;
  • atmospheric effects;
  • scale models; and
  • physically altered spatial arrangements.

The camera then records this constructed spatial reality as though it were an ordinary scene.

Such techniques show that Cinema Perspective can modify not only the image but also the physical target space itself.

Optical Special Effects

Optical Special Effects transform or combine photographic images using cameras, lenses, projectors, mirrors and related optical systems.

Historical techniques include:

  • optical printing;
  • double exposure;
  • matte imagery;
  • split-image techniques;
  • rear projection;
  • front projection;
  • miniature photography;
  • lens-based transformations; and
  • multiple-image compositing.

These techniques allow separately captured image spaces to be combined into one apparently continuous cinematic reality.

Rear or Back Projection

Back Projection or Rear Projection places a projected moving image behind performers.

A previously filmed background is projected onto the rear of a translucent screen while actors or objects are photographed in front of it.

The new camera therefore records two spatial layers together:

  • a real foreground space; and
  • a projected background image space.

The resulting film can make both appear to belong to one continuous spatial environment.

This is a clear example of layered, mixed and chained Cinema Perspective.

Green Screen and Composite Perspective

Digital cinema greatly expanded the ability to combine separately produced images.

Green- or blue-screen methods permit a foreground subject to be extracted and placed within another photographed, graphical or computer-generated background.

The component images may originate from:

  • different physical places;
  • different times;
  • different scales;
  • different cameras;
  • different perspective models; or
  • entirely artificial CGI environments.

For a convincing result, their perspective relationships must be coordinated sufficiently for the audience to interpret the composite as one spatial scene.

Computer-Generated Cinema Perspective

Computer Generated Imagery greatly expanded Cinema Perspective because an image no longer has to originate entirely from a photographed physical scene.

A digital three-dimensional model can be constructed and a virtual camera placed anywhere within or around it.

The process becomes:

3D Digital Model → Virtual Camera → Perspective Projection → Rendered Movie Frames → Cinema Display.

Computer graphics therefore allow:

  • imaginary environments;
  • impossible camera movements;
  • extreme scales;
  • synthetic lighting;
  • computer-generated objects;
  • animated characters;
  • simulated physical effects; and
  • perspective views impossible to capture directly with a physical camera.

Live Action and CGI Perspective

Modern cinema frequently combines photographed actors and physical sets with digitally generated spatial environments.

For the result to appear coherent, several image properties may need to be coordinated, including:

  • camera viewpoint;
  • field of view;
  • object scale;
  • spatial position;
  • motion;
  • occlusion;
  • lighting;
  • shadows;
  • focus; and
  • image resolution.

The final cinematic image can therefore be a composite spatial representation whose apparent unity conceals several independent perspective-generation processes.

Motion Capture

Motion Capture allows movements performed by real actors or objects to be recorded and transferred to computer-generated characters or models.

Volume 1 discusses the increasing combination of live-action motion capture and computer rendering in modern film.

The resulting image can combine:

  • natural human movement;
  • artificial digital form;
  • virtual spatial environments; and
  • computer-generated perspective projection.

This provides another example of cinema operating through several Perspective Categories at the same time.

Bullet-Time and Multi-View Cinema Perspective

Some cinematic techniques deliberately separate the motion of the subject from the motion of the viewpoint.

Volume 1 identifies the “bullet-time” technique associated with The Matrix as an example in which an apparently frozen or extremely slowed subject is viewed from a succession of positions around it.

This produces a form related to Sphere-of-Revolution Perspective:

Many Camera Positions around Object → Sequential Views → Apparent Moving Viewpoint around Nearly Frozen Subject.

The technique demonstrates that cinema can manipulate viewpoint and time independently rather than merely reproducing ordinary physical observation.

Camera Motion Control

Camera Motion Control allows a camera movement to be precisely planned, repeated or recorded.

This is particularly important when several separately filmed elements must later be combined.

If each component is photographed using consistent or appropriately matched camera movements, the resulting layers can be integrated more convincingly.

Modern systems can also record camera movement so that an equivalent virtual camera path can be reproduced within CGI.

Physical and virtual camera spaces can thereby be coordinated within one final Cinema Perspective.

Animated Perspective

Cinema Perspective is not restricted to photographed physical reality.

Animated Perspective can be produced through:

  • hand-drawn animation;
  • stop-motion animation;
  • computer-generated animation; and
  • hybrid combinations of these methods.

Individual images are changed progressively and displayed sequentially to create apparent movement.

The represented object space may therefore be:

  • physical;
  • graphical;
  • model-based;
  • computer-generated; or
  • entirely imaginary.

Cinema is consequently a medium capable of projecting moving perspectives of realities that never physically existed.

Digital Cinema Perspective

Modern cinema has largely moved from photochemical film towards digital capture, processing, storage, distribution and projection.

The digital image can be transformed at many stages.

It may be:

  • rescaled;
  • cropped;
  • warped;
  • colour-adjusted;
  • stabilised;
  • combined with other images;
  • reprojected;
  • integrated with CGI;
  • displayed stereoscopically; or
  • mapped onto unusual screen geometries.

Digital cinema therefore introduces extensive New Media Perspective into a medium that originally developed principally from Optical and Instrument Perspective.

On-Set Virtual Production

On-Set Virtual Production combines physical filming with digitally generated environments displayed on large LED surfaces.

The camera photographs real performers while the background may be rendered computationally in real time.

A tracked camera can be used so that the displayed background image changes according to the camera’s position and orientation.

The production chain can therefore become:

Virtual 3D Model → Perspective Rendering → LED Display → Physical Set and Actors → Cinema Camera → Composite Recorded Image.

This reverses and recombines several conventional cinematic relationships: a projected or displayed artificial perspective becomes part of the physical scene subsequently photographed by another camera.

Cinema Perspective and Image Resolution

Image resolution is particularly important in cinema because moving images are commonly enlarged enormously for theatrical presentation.

The apparent detail available to the spectator depends upon several stages:

  • resolution of the original scene capture;
  • lens quality;
  • film grain or sensor resolution;
  • focus;
  • digital processing;
  • compression;
  • projector or display resolution;
  • screen size; and
  • spectator viewing distance.

A cinema image must therefore be understood through its complete projection scale and projection-scale resolution rather than by quoting capture resolution alone.

High Frame Rate Cinema

High Frame Rate Cinematography increases temporal sampling by recording or displaying more individual frames during each second.

This can make rapid movement appear smoother and can reduce some forms of visible stroboscopic judder.

Frame rate should nevertheless be distinguished from spatial image resolution.

Increasing the number of frames per second improves temporal resolution; it does not by itself increase the number of spatial details or pixels contained within each frame.

Cinema Perspective and Spatial Illusion

Cinema is one of the most powerful artificial systems for producing an illusion of spatial reality.

A physically flat screen can represent:

  • extreme depth;
  • vast landscapes;
  • tiny microscopic spaces;
  • outer space;
  • imaginary worlds;
  • impossible architecture;
  • artificially altered scale; and
  • spatial events that never occurred physically.

The spectator nevertheless interprets the moving patterns of size, shape, overlap, texture, colour, movement and convergence as a coherent spatial world.

Cinema therefore demonstrates the extraordinary capacity of perspective to convert a flat sequence of images into an apparently inhabited and dynamic spatial environment.

Cinema Perspective and Immersion

Immersion has been a recurring goal within the development of cinema.

Different technologies have attempted to increase immersion by enlarging or enriching the perspective experience through:

  • wider images;
  • larger screens;
  • higher resolution;
  • stereoscopic presentation;
  • curved screens;
  • surrounding screens;
  • dome projection;
  • greater brightness and colour;
  • high frame rates; and
  • more extensive fields of view.

These technologies do not all create immersion in the same way. Some increase angular coverage, some add binocular depth, some improve image detail and some surround the spectator physically.

Immersion should therefore be analysed through the complete Cinema Perspective system rather than attributed to one feature alone.

Cinema Perspective and Panoramic Perspective

Cinema has repeatedly expanded beyond the conventional rectangular screen towards Panoramic Perspective.

Examples include:

  • widescreen cinema;
  • Cinerama;
  • Circle-Vision 360°;
  • IMAX;
  • OMNIMAX;
  • dome theatres; and
  • large spherical or wraparound display environments.

These systems demonstrate a long-term tendency to increase the angular extent of represented cinematic space and reduce the visual dominance of the physical screen boundary.

Cinema Perspective and 360 Degree Perspective

Cinema can also extend into 360 Degree Perspective.

A surrounding cinematic image may represent every horizontal direction around an observer.

Such a system changes the basic viewing relationship from:

looking forwards at one screen

towards:

looking around within a surrounding image environment.

A horizontal 360-degree cinema should nevertheless be distinguished from a complete spherical 360 × 180-degree image including directions above and below the observer.

Cinema Perspective and the Sphere of Vision

A surrounding cinema system can approach the logic of the Sphere of Vision.

The spectator remains at a location while the represented image extends through many different outward viewing directions.

This is a looking-around relationship.

It should be distinguished from a moving-camera system that travels around an external object, which belongs instead to a Sphere-of-Revolution or related multi-viewpoint relationship.

Cinema can use both types, but their viewpoint geometries are fundamentally different.

Cinema Perspective versus Virtual Reality

Conventional cinema normally presents a predetermined sequence of perspective views.

The spectator may look at different areas of the screen, but cannot usually select an arbitrary new camera position within the represented world.

Virtual Reality can go further by allowing the viewer to change:

  • viewing direction;
  • station point;
  • orientation;
  • movement path; and
  • sometimes scale.

The distinction can be summarised as:

Cinema = principally preselected or authored perspective sequence.

Virtual Reality = potentially user-controlled and dynamically generated perspective sequence.

Modern immersive and interactive media increasingly blur this boundary.

Cinema Perspective and Perspective Category Theory

Within Perspective Category Theory, Cinema Perspective is not a new principal Perspective Category. It is a complex application that commonly combines several existing categories and both directional classes.

  • Natural Perspective — the physical scene, actors, sets and environmental spatial relationships.
  • Optical Perspective — formation of camera and projector images through lenses and light.
  • Instrument Perspective — cameras, projectors, cinema screens and imaging systems.
  • Mathematical Perspective — projection geometry, camera models and digital transformations.
  • Graphical Perspective — animation, matte images, CGI and constructed visual representations.
  • Simulated Perspective — forced perspective, artificial sets, spatial illusions and false scene geometry.
  • New Media Perspective — digital cinematography, CGI, compositing, virtual production and computational display.
  • Visual Perspective Type 2 — the final retinal and perceptual experience of the cinema spectator.

Cinema also involves both fundamental directional classes:

  • Viewing or Imaging Class — the camera captures or generates the moving image.
  • Projecting Class — the projector or display presents the image to the spectator.

This duality makes cinema one of the clearest examples of a complete perspective system moving from scene to image and from image back into visible space.

A General Cinema Perspective Chain

A modern cinematic process can be represented in expanded form as:

Physical / Artificial / Digital Scene → Camera or Virtual Camera → Optical / Mathematical Projection → Recorded Moving Image → Editing / CGI / Compositing → Film or Digital Image → Projector / Screen → Optical View → Retinal Image → Visual Perception.

Not every film uses every stage, but the chain shows why Cinema Perspective cannot be reduced to the action of the camera alone.

The final appearance is produced by the cumulative transformations of the complete system.

Why Cinema Perspective Matters

Cinema Perspective matters because moving images fundamentally expanded the ways in which spatial reality could be represented.

Before cinema, an artificial picture normally represented one selected visual state. Cinema made it possible to represent:

  • movement through space;
  • continuous viewpoint change;
  • changing scale;
  • changing object aspect;
  • successive viewpoints;
  • temporal transformation;
  • artificial and impossible spatial worlds;
  • wide and surrounding visual fields;
  • stereoscopic depth; and
  • complex combinations of physical and artificial perspective.

Volume 1 consequently describes cinema as having introduced dramatic changes in the capture, recording, layering, processing and display of images of spatial reality.

Cinema has made moving perspective so familiar that much of modern visual culture is experienced through photographic, cinematic, television and digital image spaces rather than through direct observation alone.

Cinema Perspective — Frequently Asked Questions

What is Cinema Perspective?

Cinema Perspective is the capture, recording, processing, projection, display and viewing of moving perspective images. It includes the spatial effects produced by camera viewpoint, movement, lenses, projection, screen geometry and spectator position.

Is Cinema Perspective the same as Camera Perspective?

No. Camera Perspective describes the image-forming relationship of the camera. Cinema Perspective is broader because it includes moving-image capture, recording, processing, editing, projection or display and the spectator’s subsequent visual experience.

Why is motion important in Cinema Perspective?

Motion introduces changing viewpoint, object position, apparent size, aspect, occlusion, parallax and other spatial transformations through time. These provide perspective information unavailable within one still image.

Does moving the camera change perspective?

Yes. Translating the camera changes its station point and therefore changes the projected spatial relationships between scene elements.

Does zooming change perspective?

A simple lens zoom changes focal length, image magnification and field of view while the camera position remains fixed. It therefore does not produce the same geometrical viewpoint change as physically moving the camera.

What is the difference between a zoom and a dolly?

A zoom changes focal length while leaving the camera position fixed. A dolly physically moves the camera and therefore changes viewpoint and perspective geometry.

What is a dolly zoom?

A dolly zoom combines camera movement with an opposing lens zoom, often keeping a principal subject approximately constant in image size while the background perspective expands or compresses.

What is Motion Perspective?

Motion Perspective concerns perspective transformations produced by movement of the observer, camera, object or represented scene. Cinema is one of its principal artificial applications.

What is widescreen Cinema Perspective?

Widescreen Cinema Perspective presents a horizontally extended cinema image. Different systems achieve this through anamorphic optics, larger recording formats, multiple cameras, multiple projectors or other wide-field imaging methods.

What is Anamorphic Cinema?

Anamorphic Cinema optically compresses a wider horizontal image during capture so that it fits within a narrower recording format, then expands the image during projection or digital display.

What is Cinerama?

Cinerama was a wide-field cinema system originally using three synchronised images and projectors on a deeply curved screen to create a large panoramic field for the audience.

What is stereoscopic cinema?

Stereoscopic cinema presents related left- and right-eye images so that binocular disparity can contribute to an illusion of three-dimensional depth.

Is 3D cinema true 3D?

Stereoscopic cinema adds important binocular depth information, but it does not reproduce every spatial, optical and perceptual cue available in natural vision. It is therefore one form of artificial 3D Perspective rather than the sole form of 3D representation.

What is 360-degree cinema?

360-degree cinema extends moving imagery around the audience through a complete horizontal field. Systems such as Circle-Vision 360° surround viewers with several projected image sections.

Does a curved cinema screen automatically create cylindrical perspective?

No. Screen shape and image-projection geometry are separate. A curved screen can carry an ordinary image, while a true cylindrical-perspective representation requires image geometry appropriately generated or mapped for the cylindrical relationship.

Is a curved cinema screen automatically multi-view?

No. A genuinely multi-view system must provide different viewpoint-dependent image information for different observer positions. Merely viewing one fixed image from several physical positions does not create new perspective views of the represented scene.

What is Forced Perspective in cinema?

Forced Perspective manipulates physical size, distance, scale or spatial arrangement so that the selected camera viewpoint records an intentionally misleading impression of the actual scene geometry.

What are optical special effects?

Optical special effects use photographic, lens, projection or optical-compositing methods to transform or combine moving images, producing scenes or spatial relationships that did not exist in that form before the camera.

What is CGI Perspective in cinema?

CGI Perspective uses computer-generated models and virtual cameras to calculate perspective views that can be animated, rendered and incorporated into moving-image productions.

What is virtual production?

Virtual production combines physical performers and camera photography with computer-generated environments, often displayed on LED screens whose image perspective can be adjusted according to a tracked production camera.

Why does the spectator viewpoint matter?

The cinema image was captured or generated according to one projection geometry, but spectators may view the screen from different positions and distances. The relationship between camera viewpoint, projection geometry, screen and spectator can therefore affect perceived shape, scale and depth.

Is Cinema Perspective a Perspective Category?

No. Within Perspective Category Theory, Cinema Perspective is a complex application involving several categories, particularly Optical, Instrument, Graphical, Simulated and New Media Perspective, together with the Viewing or Imaging and Projecting classes.

Cinema Perspective within the Wider Field of Perspective

Cinema transformed perspective by making the perspective image temporal, movable, reproducible, projectable and transformable.

A cinema camera can move through space, rotate, change its field of view and record objects in motion. Editing can join different viewpoints. Optical and digital effects can combine different spatial realities. CGI can create entirely artificial worlds. Stereoscopic systems can add binocular disparity, while wide-field and spherical displays can extend the image around the observer.

The resulting cinema experience is therefore not produced by one camera or one projection alone. It is the outcome of an extended chain linking object space, camera viewpoint, optical projection, moving images, recording, processing, display geometry, spectator position and visual perception.

Seen in this wider context, Cinema Perspective is one of the most important modern expansions of perspective: the transformation of spatial reality from a static view into a moving, changing and potentially immersive visual world.