EV (exposure values)
Combination of a camera exposure time and lens aperture giving the same sensor exposure. By convention, EV is expressed on a logarithm 2 basis, so doubling the sensor exposure corresponds to EV+1.
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.
Time during which a sensor acquires ambient light.
Operation that creates values from a sequence of known values.
Field of view
Angular extent of the part of the scene viewed by a camera.
Optical component that removes some light, either to lower intensity (neutral filters) or to change the light spectrum (colored filters).
Optical artifact coming from reflection on lenses, usually visible with a bright light source (such as the sun). Can lead to “ghosts” of the light source or “veiling glare” (loss of contrast) that creates a foggy effect on the image.
Plane perpendicular to the optical axis at which an object at infinity is in focus.
Distance at which objects are in focus.
Choosing the part of a scene that is visible in a photo.
By reference to silver-halide photography, sensors whose dimensions are 36x24mm.
Multiplicative numerical value used to amplify a signal.
Appearance of the noise in a homogeneous part of an image.
Numerical values related to the amount of light a pixel receives.
Uniform part of a color-neutral chart.
Gretag Macbeth Color Checker
Target commercialized by Xrite, containing 24 colored patches, commonly used for color reproduction testing.
Exposure levels close to or beyond saturation. Burned areas appear white and uniform.
Perceptual property of colors like red, blue, yellow...