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Exposure (photography)

Index Exposure (photography)

In photography, exposure is the amount of light per unit area (the image plane illuminance times the exposure time) reaching a photographic film or electronic image sensor, as determined by shutter speed, lens aperture and scene luminance. [1]

56 relations: Aperture, Aperture priority, APEX system, Bracketing, Bulb (photography), Camera, Clipping (photography), Depth of field, Digital camera, Digital image processing, Dynamic range, Exposing to the right, Exposure value, F-number, Fill light, Film noir, Film speed, Full-spectrum photography, Gobo (lighting), Graduated neutral-density filter, Graphics software, Gray card, High-dynamic-range imaging, Illuminance, Image sensor, Infrared cut-off filter, Infrared photography, International Organization for Standardization, Irradiance, Light meter, Light painting, Light value, List of abbreviations in photography, Luminance, Lux, Maroon 5, Metering mode, Motion blur, Multiple exposure, Night photography, Photographic film, Photography, Photometry (optics), Reciprocity (photography), Second, Sensitometry, Shutter (photography), Shutter priority, Shutter speed, Spectral sensitivity, ..., Spectrophotometry, Sunny 16 rule, Through-the-lens metering, UV filter, Zebra patterning, Zone System. Expand index (6 more) »


In optics, an aperture is a hole or an opening through which light travels.

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Aperture priority

Aperture priority, often abbreviated A or Av (for aperture value) on a camera mode dial, is a setting on some cameras that allows the user to set a specific aperture value (f-number) while the camera selects a shutter speed to match it that will result in proper exposure based on the lighting conditions as measured by the camera's light meter.

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APEX system

APEX stands for Additive system of Photographic EXposure, which was proposed in the 1960 ASA standard for monochrome film speed, ASA PH2.5-1960, as a means of simplifying exposure computation.

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In photography, bracketing is the general technique of taking several shots of the same subject using different camera settings.

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Bulb (photography)

The Bulb setting (abbreviated B) on camera shutters is a momentary-action mode that holds shutters open for as long as a photographer depresses the shutter-release button.

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A camera is an optical instrument for recording or capturing images, which may be stored locally, transmitted to another location, or both.

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Clipping (photography)

In digital photography and digital video, clipping is a result of capturing or processing an image where the intensity in a certain area falls outside the minimum and maximum intensity which can be represented.

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Depth of field

In optics, particularly as it relates to film and photography, the optical phenomenon known as depth of field (DOF), is the distance about the Plane of Focus (POF) where objects appear acceptably sharp in an image.

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Digital camera

A digital camera or digicam is a camera that captures photographs in digital memory.

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Digital image processing

In computer science, Digital image processing is the use of computer algorithms to perform image processing on digital images.

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Dynamic range

Dynamic range, abbreviated DR, DNR, or DYR is the ratio between the largest and smallest values that a certain quantity can assume.

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Exposing to the right

In digital photography, exposing to the right (ETTR) is the technique of adjusting the exposure of an image as high as possible at base ISO (without causing unwanted saturation) to collect the maximum amount of light and thus get the optimum performance out of the digital image sensor.

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Exposure value

In photography, exposure value (EV) is a number that represents a combination of a camera's shutter speed and f-number, such that all combinations that yield the same exposure have the same EV (for any fixed scene luminance).

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The f-number of an optical system (such as a camera lens) is the ratio of the system's focal length to the diameter of the entrance pupil.

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Fill light

In television, film, stage, or photographic lighting, a fill light (often simply fill) may be used to reduce the contrast of a scene to match the dynamic range of the recording media and record the same amount of detail typically seen by eye in average lighting and considered normal.

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Film noir

Film noir is a cinematic term used primarily to describe stylish Hollywood crime dramas, particularly those which emphasize cynical attitudes and sexual motivations.

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Film speed

Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system.

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Full-spectrum photography

Full-spectrum photography is a subset of multispectral imaging, defined among photography enthusiasts as imaging with consumer cameras the full, broad spectrum of a film or camera sensor bandwidth.

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Gobo (lighting)

A gobo is a stencil or template placed inside or in front of a light source to control the shape of the emitted light.

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Graduated neutral-density filter

A graduated neutral-density filter, also known as a graduated ND filter, split neutral-density filter, or just a graduated filter, is an optical filter that has a variable light transmission.

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Graphics software

In computer graphics, graphics software refers to a program or collection of programs that enable a person to manipulate images or models visually on a computer.

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Gray card

A gray card is a middle gray reference, typically used together with a reflective light meter, as a way to produce consistent image exposure and/or color in film and photography.

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High-dynamic-range imaging

High-dynamic-range imaging (HDRI) is a high dynamic range (HDR) technique used in imaging and photography to reproduce a greater dynamic range of luminosity than is possible with standard digital imaging or photographic techniques.

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In photometry, illuminance is the total luminous flux incident on a surface, per unit area.

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Image sensor

An image sensor or imaging sensor is a sensor that detects and conveys the information that constitutes an image.

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Infrared cut-off filter

Infrared cut-off filters, sometimes called IR filters or heat-absorbing filters, are designed to reflect or block mid-infrared wavelengths while passing visible light.

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Infrared photography

Top: tree photographed in the near infrared range.

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International Organization for Standardization

The International Organization for Standardization (ISO) is an international standard-setting body composed of representatives from various national standards organizations.

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In radiometry, irradiance is the radiant flux (power) received by a surface per unit area.

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Light meter

A light meter is a device used to measure the amount of light.

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Light painting

Light painting, light drawing, or light art performance photography is a photographic technique in which exposures are made by moving a hand-held light source while taking a long exposure photograph, either to illuminate a subject or to shine a point of light directly at the camera, or by moving the camera itself during exposure.

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Light value

In photography, light value has been used to refer to a “light level” for either incident or reflected light, often on a base-2 logarithmic scale.

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List of abbreviations in photography

During most of the 20th century photography depended mainly upon the photochemical technology of silver halide emulsions on glass plates or roll film.

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Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction.

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The lux (symbol: lx) is the SI derived unit of illuminance and luminous emittance, measuring luminous flux per unit area.

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Maroon 5

Maroon 5 is an American pop rock band from Los Angeles, California.

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Metering mode

In photography, the metering mode refers to the way in which a camera determines exposure.

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Motion blur

Motion blur is the apparent streaking of moving objects in a photograph or a sequence of frames, such as a film or animation.

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Multiple exposure

In photography and cinematography, a multiple exposure is the superimposition of two or more exposures to create a single image, and double exposure has a corresponding meaning in respect of two images.

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Night photography

Night photography refers to photographs taken outdoors between dusk and dawn.

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Photographic film

Photographic film is a strip or sheet of transparent plastic film base coated on one side with a gelatin emulsion containing microscopically small light-sensitive silver halide crystals.

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Photography is the science, art, application and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film.

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Photometry (optics)

Photometry is the science of the measurement of light, in terms of its perceived brightness to the human eye.

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Reciprocity (photography)

In photography reciprocity is the inverse relationship between the intensity and duration of light that determines the reaction of light-sensitive material.

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The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.

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Sensitometry is the scientific study of light-sensitive materials, especially photographic film.

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Shutter (photography)

In photography, a shutter is a device that allows light to pass for a determined period, exposing photographic film or a light-sensitive electronic sensor to light in order to capture a permanent image of a scene.

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Shutter priority

Shutter priority refers to a setting on some cameras that allows the user to choose a specific shutter speed while the camera adjusts the aperture to ensure correct exposure.

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Shutter speed

In photography, shutter speed or exposure time is the length of time when the film or digital sensor inside the camera is exposed to light, also when a camera's shutter is open when taking a photograph.

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Spectral sensitivity

Spectral sensitivity is the relative efficiency of detection, of light or other signal, as a function of the frequency or wavelength of the signal.

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In chemistry, spectrophotometry is the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength.

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Sunny 16 rule

In photography, the sunny 16 rule (also known as the sunny rule) is a method of estimating correct daylight exposures without a light meter.

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Through-the-lens metering

In photography, through-the-lens (TTL) metering refers to a feature of cameras whereby the intensity of light reflected from the scene is measured through the lens; as opposed to using a separate metering window or external hand-held light meter.

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UV filter

UV filters are individual compounds or mixtures that block or absorb ultraviolet (UV) light.

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Zebra patterning

Zebra patterning (or zebra stripes) is a feature found on some prosumer and most professional video cameras to aid in correct exposure.

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Zone System

The Zone System is a photographic technique for determining optimal film exposure and development, formulated by Ansel Adams and Fred Archer.

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Auto-exposure, Autoexposure, Blown highlights, Blown-highlight, Crushed black, Luminous exposure, Lux second, Manual exposure, Overexpose, Overexposed, Overexposure, Photographic exposure, Photometric exposure, Underexposure.


[1] https://en.wikipedia.org/wiki/Exposure_(photography)

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