Browse

The camera electronics that turn raw image-tube current into a levelled, corrected, bandwidth-limited video output.

Why an out-of-focus point copies the aperture outline — and how a regular-polygon convolution kernel turns night highlights into visible iris shapes.

Why an off-axis point can focus at two different image distances — and how a field-oriented line spread reproduces the resulting directional blur.

How intense target regions spread into neighbouring samples, producing a soft halo that grows with highlight level.

The end-to-end television path that forms a broadcast signal, radiates it through a channel, and recovers video at a receiver.

A shared optical front end followed by film, analog electronic, or digital capture.

How finite target resolution, charge spreading, beam footprint, and analogue bandwidth soften spatial detail in a camera-tube image.

How uneven contact with developer, bleach, fixer, wash water, or contaminants can change local emulsion density and leave soft-edged light, dark, or stained blotches fixed to individual film frames.

A colour model defines coordinates; a colour space makes them specific through reference conditions and, where applicable, primaries, white and transfer behaviour.

How spectrally overlapping emulsion layers form cyan, magenta, and yellow dye records whose nonlinear interactions reshape hue, saturation, and tone — and why faithful correction is a three-dimensional colour transform.

Why an off-axis point grows an asymmetric comet-shaped footprint — and how a primary-coma pupil map reproduces the field-dependent point spread.

How target dark current and electrical fluctuations become most visible where the useful video signal is weak.

Why a scene point becomes a circle of confusion when its image plane does not coincide with the sensor — and what a uniform disk blur can and cannot reproduce.

Why straight aperture edges turn bright point sources into directional rays — and how a brightness-gated line gather reproduces the pattern without blurring the whole frame.

How unequal travel time through the encoder displaces colour information horizontally from the brightness structure that belongs to it.

Why a lens can focus a flat subject onto a curved surface — and how a field-dependent disk blur reveals the mismatch with a flat sensor.

A mechanical camera that times exposure with a shutter and advances photosensitive film through a registered frame gate.

How particles on or close to film form compact, frame-bound silhouettes whose sharpness and displayed polarity reveal where and when contamination entered the photochemical chain.

How frame-to-frame changes in shutter timing alter the exposure of complete film frames, producing a global brightness pulse without moving or locally deforming the image.

How unequal dye survival, metallic-silver loss, support staining, and spatially uneven deterioration change a stored film element over time.

How randomly distributed photosensitive grains become visible density variation after development — and how to approximate that moving, exposure-dependent texture without turning it into RGB sensor noise.

How intense light that passes through the emulsion can scatter back from the film base, exposing nearby image-forming material and leaving a soft, often red-orange halo around highlights.

How stray light entering through a camera or magazine seam exposes part of the film outside the intended lens-and-shutter path, producing a soft edge or corner fog that may vary as the strip moves.

A reproduction device that advances developed film through a gate, holds each frame for illumination, and projects it through an output lens.

How abrasive contact during film transport removes or scores emulsion into narrow longitudinal tracks whose displayed polarity depends on the damaged generation and later copying.

Why changing focus can subtly change framing — and how to reproduce that field-of-view shift without confusing it with defocus.

How imperfect film registration shifts each exposed or reproduced frame relative to a fixed gate, producing rigid frame-to-frame image movement that usually follows the transport axis.

How a small gap between film and the camera gate turns the aperture edge into a narrow, slightly soft rectangular shadow around the recorded frame.

How scan and readout nonuniformity can reduce signal level toward the beginning and end of each horizontal line.

How horizontal beam-deflection variation shifts individual camera-raster lines sideways, producing line-dependent jitter and waviness.

How a picture becomes one electrical signal, travels as a radio wave, and is rebuilt by a television.

How wavelength-dependent magnification separates colour channels toward the image edge — and how three inverse texture lookups reproduce it.

How unintended reflections between optical surfaces turn a bright source into veiling light and a line of coloured ghosts — and how to approximate that pattern with bounded procedural sprites.

The groups of glass, mechanics, and aperture that form an image.

Why different wavelengths can focus at different distances behind a lens — and how channel-specific defocus produces coloured fringes around the same image features.

How a film camera’s intermittent transport limits capture cadence, turning continuous motion into a sequence of held frames that must carry one shared timestamp through the processing pipeline.

How unequal baseband bandwidth changes the relative sharpness of brightness and colour detail before composite television encoding.

How exposure and development turn a monochrome emulsion into a nonlinear density scale with compressed shadows, rolled highlights, and a printable tint — and how to reproduce that appearance with a bounded tone curve.

Why an ideal lens delivers less irradiance at oblique field angles — and how to apply the photometric law in linear light.

How excessive composite-video excursion drives the vision carrier beyond its permitted envelope and damages highlights, colour, and sometimes synchronization.

A light-sensitive material that records a latent image, turns it into stable optical density through development, and carries that image through handling, storage, and projection.

How failed or offset intermittent registration moves the projected gate across film-frame boundaries, exposing a horizontal frame line and part of a neighbouring image.

How lateral clearance or wear lets a projected film frame sit at changing side-to-side positions inside a fixed gate.

Why straight lines bend near the edge of a real lens — and how to reproduce the mapping in a shader.

How clamp, gain, black level, and camera transfer processing compress the separation between dark and bright signal levels.

How unequal tube channels, colour encoding, bandwidth, and analogue processing reduce chroma relative to luminance.

How the camera tube’s electron beam converts a two-dimensional target pattern into a sequential signal one horizontal line at a time.

Light emitted by sources, transported through the scene, reflected by surfaces, and directed toward a camera or observer.

How malformed composite-video references make a receiver misplace the picture in time or recover the wrong brightness range.

How a decentered or tilted lens breaks radial symmetry — and how an iterative shader reconstructs the source coordinate.

The transmitting-side equipment that forms the vision waveform, generates the television RF channel, and delivers it to the antenna feed.

A photoconductive camera tube that stores an optical image as a target-potential pattern and reads it with a scanning electron beam.

Why a photoconductive camera-tube target keeps part of a bright image between scans — and how a brightness-dependent temporal history reproduces the visible trail.