Definition: Annealed polyethylene naphthalate-a polyester material used as the base on Advanced Photo System film; thinner, stronger and flatter than the acetate base traditionally used in consumer photographic roll films.
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Showing posts with label A. Show all posts
Showing posts with label A. Show all posts
Sunday, March 30, 2008
A. S. A.
Definition: An absolute term indicating a film's sensitivity to light. The letters stands for American Standards Association . The term as been replaced by ISO standing for International Standards Organization.
A/D CONVERTER
Definition: A device used to convert analog data to digital data. Analog data is continuously variable, while digital data contains discrete steps.
ABBE NUMBER
Definition: denotes the degree of refraction of light of different wavelengths to different extents, given by a transparent material, such as glass. The lower the Abbe number, the greater the dispersion of colors.
ABERRATION
Definition: (1) Something that prevents light from being brought into sharp focus, disenabling the formation of a clear image. (2) Lens flaw - the inability of a lens to reproduce an accurate, focused, sharp image. Aberration in simple lenses is sub-categorized into seven types:
Definition: An optical defect in a lens causing it to form an image that is not sharp or that is distorted. See also astigmatism, barrel distortion, chromatic aberration, coma, field curvature, pincushion distortion, spherical aberration.
Definition: the inability of a lens to produce a perfect, sharp image, especially towards the edge of the lens field. These faults can be reduced by compound lens constructions, and the use of small apertures.
Definition: An optical defect in a lens causing it to form an image that is not sharp or that is distorted. See also astigmatism, barrel distortion, chromatic aberration, coma, field curvature, pincushion distortion, spherical aberration.
Definition: the inability of a lens to produce a perfect, sharp image, especially towards the edge of the lens field. These faults can be reduced by compound lens constructions, and the use of small apertures.
ABRASION MARKS
Definition: marks on the emulsion surface of a film, caused by scratching. It can be due to traces of dirt trapped between layers of film as it is wound on the spool, or to grit on the pressure plate.
Definition: On the emulsion surface of the film are caused by scratching. It can be due to traces of dirt trapped between layers of film as it is wound on the spool, dirt in the film holder or grit on the pressure plate
Definition: On the emulsion surface of the film are caused by scratching. It can be due to traces of dirt trapped between layers of film as it is wound on the spool, dirt in the film holder or grit on the pressure plate
ABSOLUTE COLORIMETRIC
Definition: A rendering intent that aims to maintain colour accuracy at the expense of preserving relationships between colours, used to predict how images will appear when printed on paper or other substrate with a distinct colour cast, such as newsprint. With absolute colorimetric rendering intent, colours that falls inside the destination gamut remain unchanged, while out-of gamut colours are clipped. Colours are not scaled to the destination white point.
ABSOLUTE RELEASED IMAGES
Definition: any images for which signed model or property releases are on file and immediately available.
ABSOLUTE TEMPERATURE
Definition: the temperature at which most molecular movement ceases. It is often referred to as absolute zero (-273° C).
ABSOLUTE WHITE
Definition: In theory, a material that perfectly reflects all light energy at every visible wavelength. In practice, a solid white known spectral data used as the " reference white " for all measurements of absolute reflectance.
ABSORPTION
Definition: the process by which light falling on a surface is partially absorbed by the surface.
Definition: Occurs when light is partially or completely absorbed by a surface, converting its energy to heat.
Definition: Occurs when light is partially or completely absorbed by a surface, converting its energy to heat.
ABSTRACT
Definition: subjective, non-realistic image. An abstraction photograph generally contains a design of patterns or shapes where the identity of a subject is not evident.
Definition: In the photographic sense, an image that is conceived apart from concrete reality, generally emphasizing lines, colours and geometrical forms, and their relationship to one another.
Definition: In the photographic sense, an image that is conceived apart from concrete reality, generally emphasizing lines, colours and geometrical forms, and their relationship to one another.
ACCELERATOR
Definition: Is a chemical added to a developer solution to speed up the slow working action of the reducing agents in the solution.
ACCEPTABLE CIRCLE OF CONFUSION
Definition: the size of the largest circle which the eye cannot distinguish from a dot. In 35mm format cameras, a 0. 03mm diameter circle of confusion is considered acceptable. It is used to calculate depth-of-field or depth of focus.
ACCESS
Definition: To acquire data into a computer system, typically from a storage device or from an input device.
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