Home Wikituition Browse all terms Categories
Random term

Browse the dictionary

840 terms · page 13 of 35


A–Z
All A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0–9
Files, Metadata & Workflow

File Size

The storage a file occupies, determined by pixel count, bit depth, channel count and compression.

Bytes ≈ px × channels × bits / 8 MB
Lighting & Flash

Fill Light

A secondary, weaker light or reflector used to raise the shadows the key light casts, controlling contrast.

Ratio = key / fill f-stops (EV)
Composition & Visual Design

Filling the Frame

Composing so the subject occupies most or all of the picture area, leaving little surrounding context.

Film, Darkroom & Historic Processes

Film

A flexible transparent base coated with a light-sensitive emulsion, which records an image chemically rather than electronically.

mm / format
Film, Darkroom & Historic Processes

Film Base

The transparent support that carries the emulsion, historically nitrate or acetate and now usually polyester.

µm
Film, Darkroom & Historic Processes

Film Grain

The visible texture produced by clumps of developed silver, which becomes more apparent with faster films and greater enlargement.

RMS granularity
Post-Processing & Retouching

Film Simulation

A colour and tone rendering designed to imitate the response of a specific photographic film.

Film, Darkroom & Historic Processes

Film Speed

A film's sensitivity to light, rated on the ISO scale and formerly as ASA or DIN.

ISO arithmetic = 2^((DIN−1)/10) ISO
Exposure & Metering

Filter Factor

The exposure increase, in stops or as a multiplier, needed to compensate for the light a filter absorbs.

Stops = log₂(factor) stops (EV)
Genres, Movements & Theory

Fine Art Photography

Photography made primarily as an expressive work rather than to document, illustrate or sell a product.

Optics, Lenses & Filters

Fisheye Lens

An ultra-wide lens that deliberately abandons rectilinear projection, bending straight lines to squeeze 180° or more into the frame.

r = f × θ (equidistant) mm
Sensors & Digital Capture

Fixed Pattern Noise

Noise that appears in the same places on every frame, caused by small manufacturing differences between photosites.

Film, Darkroom & Historic Processes

Fixer

A solution that dissolves the undeveloped silver halide, making the image permanent and no longer light-sensitive.

minutes
Lighting & Flash

Flag

An opaque black panel placed to block light from reaching a specific area.

cm
Cameras, Formats & Systems

Flange Focal Distance

The distance from a camera's lens mounting flange to the sensor or film plane.

mm
Lighting & Flash

Flash Duration

How long a flash's burst of light actually lasts, which sets its ability to freeze motion independently of shutter speed.

t.1 ≈ 3 × t.5 seconds
Lighting & Flash

Flash Exposure Compensation

An offset applied to TTL flash output, in stops, independent of the ambient exposure compensation.

stops (EV)
Lighting & Flash

Flash Exposure Lock

A control that fires the metering preflash in advance and holds the resulting power setting for subsequent frames.

Lighting & Flash

Flash Sync Speed

The fastest shutter speed at which a focal-plane shutter is fully open, and therefore the fastest speed at which flash can light the whole…

seconds
Sensors & Digital Capture

Flat Field Correction

Dividing an image by a frame of evenly illuminated field to remove vignetting, dust shadows and photosite sensitivity variation.

Corrected = (light − dark) / (flat − bias)
Motion, Video & Creative Techniques

Flat Picture Profile

A camera setting that reduces contrast and saturation to retain more information for later adjustment, without the full complexity of log.

Exposure & Metering

Flicker Reduction

A camera function that times the shutter release to the peak of a pulsing artificial light source, preventing exposure and colour shifts…

Cycle = 2 × mains frequency Hz
Optics, Lenses & Filters

Fluorite Element

An element made of grown calcium fluoride crystal, which has exceptionally low dispersion and enables near-perfect colour correction.

count
Optics, Lenses & Filters

Focal Length

The distance from a lens's optical centre to the sensor when the lens is focused at infinity, which determines magnification and angle of…

1/f = 1/u + 1/v mm