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Terms starting with L

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Cameras, Formats & Systems

Lens Mount

The mechanical and electronic interface that couples a lens to a camera body.

Post-Processing & Retouching

Levels

A tonal adjustment that sets the black point, white point and midtone gamma of an image or channel.

levels (0-255)
Motion, Video & Creative Techniques

Levitation Photography

A composite technique creating the appearance of a subject floating, by combining a supported pose with a clean background frame.

count
Lighting & Flash

Light Falloff

The rate at which illumination decreases with distance from the source, across the subject or into the background.

E ∝ 1 / d² stops (EV)
Motion, Video & Creative Techniques

Light Painting

Illuminating a scene, or drawing in the air, with a moving light source during a long exposure.

seconds
Motion, Video & Creative Techniques

Light Trails

Continuous streaks recorded when a moving light source crosses the frame during a long exposure.

seconds
Lighting & Flash

Lighting Ratio

The relationship between the illumination on the lit side of a subject and that on the shadow side, expressed as a ratio or in stops.

Ratio = (key + fill) : fill ratio / stops
Colour & Colour Management

Lightness

The perceived brightness of a colour on a scale from black to white, independent of its hue and chroma.

L* = 0 (black) to 100 (white) L*
Sensors & Digital Capture

Line Skipping

Reading only a fraction of a sensor's rows to produce a lower-resolution image quickly, discarding the rest.

Composition & Visual Design

Linear Perspective

The geometric effect by which parallel lines receding from the viewer appear to converge toward a point.

Sensors & Digital Capture

Linear Response

The property of a digital sensor that its output is directly proportional to the number of photons received.

Signal ∝ photons
Post-Processing & Retouching

Liquify

A tool that pushes, pulls, expands or contracts image areas as though the pixels were fluid.

px
Cameras, Formats & Systems

Live View

A mode that shows a continuous sensor feed on the rear screen instead of, or as well as, the viewfinder.

Post-Processing & Retouching

Local Contrast

Contrast measured between neighbouring areas rather than across the whole tonal range, which strongly affects perceived depth and clarity.

%
Motion, Video & Creative Techniques

Log Profile

A recording curve that stores tonal information logarithmically to preserve maximum dynamic range for grading.

stops
Motion, Video & Creative Techniques

Long Exposure

An exposure lasting long enough that moving elements record as blur or streaks while static ones stay sharp.

seconds
Sensors & Digital Capture

Long Exposure Noise Reduction

A camera function that records a second, unexposed frame of equal duration and subtracts its noise pattern from the image.

Optics, Lenses & Filters

Longitudinal Chromatic Aberration

Colour fringing caused by different wavelengths focusing at different distances, producing purple in front of focus and green behind it.

Colour & Colour Management

Look-up Table (LUT)

A table mapping input colour values to output values, used to apply a colour transformation quickly and repeatably.

Exposure & Metering

Looney 11 Rule

The lunar counterpart to Sunny 16: a full moon is correctly exposed at f/11 with a shutter speed of one over the ISO.

t = 1/ISO at f/11 stops (EV)
Lighting & Flash

Loop Lighting

A portrait pattern in which the nose casts a small loop-shaped shadow onto the cheek without touching the cheek shadow.

Files, Metadata & Workflow

Lossless Compression

Compression that reduces file size while allowing the original data to be reconstructed exactly.

ratio
Files, Metadata & Workflow

Lossy Compression

Compression that permanently discards image information judged least perceptible, in exchange for much smaller files.

ratio
Composition & Visual Design

Low Angle

A viewpoint below the subject, looking upward.

degrees