[Nota editorului]În cazul fotografiei digitale este un proces reversibil
(1) Exposure occurs when light is permitted to strike a digital camera s image sensor or a traditional camera s film - i.e. when the sensor/film is exposed to light. (2) Exposure is the total amount of light striking the sensor/film or other photographic material. (3) Also refers to a combination of shutter speed and aperture used in exposing the sensor/film in a camera, as in My light meter shows an exposure (or an exposure reading) of 1/125 second at Æ’/11. Aperture and shutter speed combinations are referred to as exposure settings. Proper exposure refers to an exposure setting that produces an image satisfactory to the photographer. Correct exposure is that amount of light that makes an acceptably-good image.
Deliberately changing the exposure settings recommended by a light meter in order to obtain proper exposure. (Sometimes an exposure meter or light meter is tricked into providing settings that willunderexpose or overexpose an image, for example, when the subject is relatively small in a field of bright, white snow. In such a case, a light meter may provide exposure settings that would underexpose the subject, and the photographer needs to compensate to obtain proper exposure.) The range of brightness, including shadow detail, that a film or digital sensor can record in a single image before the highlights wash out or the shadows become muddy - is that film s or sensor s exposure latitude.
A number that indicates a film s effective speed.
A measure of a specific filmâ€™s or a digital sensor s ability to be overexposed or underexposed and still produce an acceptable image. It is measured in a range of Æ’-stops. Most negative films (regardless of brand name) have an exposure latitude of five to seven stops, whereas most transparency (slide) films have less exposure latitude â€“â€“ in the range of three to five Æ’-stops. There is almost no exposure latitude when shooting digitally - perhaps a third of a stop.
The range of exposures in which a satisfactory image will be produced on a particular type of film or sensor.
An instrument containing a light-sensitive cell used to measure the amount of light reflected from or falling on a subject. The measurement is usually expressed in shutter speed and aperture combinations that will render an acceptable exposure. (Also known as a light meter.)
Light reading instruments that yield signals that are translated to f-stops and shutter speeds. Reflected-light meters read light reflected off the subject incident meters reads light falling upon the subject. All in-camera meters are of the reflected-light type.
The aperture and shutter speed combination used to expose the film in a camera.
The Exposure Value (EV) system, which originated in Germany in the 1950s, was created to be a simple to use substitute for the shutter speed/aperture combination at a given ISO, using a single number instead of a combination of numbers. A change of one EV is equivalent to a one stop change - that is, a one stop adjustment in either shutter speed, aperture or ISO setting. EV is typically used when adjusting exposure compensation and image bracketing, where +1EV, for example, means a one stop increase in exposure.
the total amount of light reaching the digital sensor. It is controlled by setting the aperture, shutter speed and ISO. Discover how these 3 elements work together in our article on the Exposure Triangle.
Amount of light that acts on a photographic material; product of illumination intensity (controlled by the lens opening) and duration (controlled by the shutter opening and the frame rate).
Amount of light that hits the image sensor of film controlled by the shutter speed and aperture.
The quantity of light allowed to act on a photographic material; product of the intensity (controlled by the lens opening) and the duration (controlled by the shutter speed or enlarging time) of light striking the film or paper.
Amount of light hitting camera sensor when capturing an image.
Amount of light that falls on a sensor or a film during the exposure time, expressed in lux.sIt is dependent upon scene luminance, aperture and exposure time.
Exposure is the act of making film available to light so that an image is formed in the emulsion.
Exposure is the phenomenon of light striking the surface of film or a digital imaging sensor. The exposure is determined by the volume of light passing through the lens aperture (f/stop) combined with the duration of the exposure (shutter speed). For more on this subject, see the explora article, ://www.bhphotovideo.com/explora/photography/tips-and-solutions/understanding-aperture Understanding Aperture.The proper exposure, which is best determined using a light meter, can be established in a number of exposure modes including manual, program (automatic), shutter priority, and aperture priority. For more on this subject, see the explora article, ://www.bhphotovideo.com/explora/photography/tips-and-solutions/understanding-camera-shootingexposure-modes Understanding Camera Shooting/Exposure Modes.
Light striking a sensitized material (film or paper emulsion).
The action of exposing a photographic film to light or other radiation.
The amount of light reaching light sensitive material such as film, printing paper or a CCD. Exposure is controlled by the shutter speed (time) and aperture (intensity).