Basic Photography Course

COUPLER

耶hemical compound in color developer

that can react with the oxidized developing agent in
the sensitized material to form a dye color.

CRITICAL FOCUS

茅hat point of focus at which

resolution is at its maximum. (NMA)

CROP

茅o trim or cut off parts of the picture by printing

methods to eliminate superfluous portions, and thus
improve the composition.

CROP MARKS

胞arkings placed on original copy,

indicating where part of the top, bottom, or sides of
the picture are to be omitted.

CURVATURE OF FIELD

耍n aberration of a lens that

causes the image of a plane to be focused into a
curved surface instead of into a plane.

CUTAWAYS (MOTION PICTURE)

范hots of related

and previously established outside interest used to

divert the audience attention in order to cover jumps
in action, screen-direction changes, and passage of
time.

D-LOG E CURVE范ee

CHARACTERISTIC CURVE.

DARK SLIDE

茅he opaque slide that covers the film

in a film holder, plate holder, film pack, or film
magazine.

AI-5

DARKROOM

耍 room in which all light of color

quality not safe for undeveloped sensitized
materials has been excluded. It is used for loading

and unloading and the developing of exposed

photographic film or paper.

DENSITOMETER

胖evice to measure the optical

density of an image or base by measuring the
amount of incident light reflected or transmitted.
(NABDC)

DENSITY

茅he light-absorbing quality of a photo-

graphic image is usually expressed as the logarithm
of the opacity. Several specific types of density
values for a photograph may be expressed; however
diffuse transmission density is one of the most
important for photographic transparency materials,
such as negatives. Diffuse reflection density is
generally of interest for photographic prints.

DEPTH

背n a nonstereoscopic picture, an illusion of

three-dimensional space that is sometimes created
by a combination of favorable lighting and coloring
of the set and favorable viewing conditions for the
reproduction.

DEPTH OF FIELD

茅he distance between the points

nearest and farthest from the camera that are
acceptably sharp at a given lens setting.

DEPTH OF FOCUS

茅he allowable error in lens-

to-film distance within which an acceptably sharp
image of the subject focused upon will still be
obtained.

DEVELOPER (CHEMICAL)

耍 chemical reagent

used to produce a visible image on an exposed
photographic layer.

DEVELOPER, COLOR

耍 photographic developing

solution capable of reducing silver halides with the
simultaneous production of an insoluble colored

oxidation product in the regions where silver is
deposited.

DEVELOPING AGENT

耶hemicals used in the

photographic processing baths to convert the latent
image into a visible and photographically useful
image.

DIAPHRAGM

耍 device, such as a perforated plate or

an iris, that limits either the aperture of the lens, the
field covered by the lens, or both, depending upon

its location.

DICHROIC FOG

耍 deposit of colloidal silver on a

photographic film caused by improper processing.
This deposit commonly appears red by transmitted
light and greenish by reflected light.

DIFFRACTION (OPTICS)

茅he bending of light

waves around the edges of opaque objects.

DIFFUSER

胖evice for obtaining diffuse direct

illumination, such as a wire screen, piece of cloth,
or translucent membrane, placed between a light
source and the subject illuminated.

DIFFUSION

�(l) (Optical) The scattering of light rays

so as to cause the light falling on a surface or passing
through an aperture to be coming from all directions
in contrast to the regular radiation of light from a
point source. Diffusion may be introduced by

reflection from a matte surface, by transmission
through a frosted or opal glass, or by the use of an
integrating bar. When diffusion is complete, a sharp
image of the light source can no longer be seen, and
its place is taken by a uniform, extended source that
emits light equally in all directions. (2) (Chemical)
The migration of molecules or ions in a solution
tending to reduce a difference in concentration

between two adjacent regions.

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Basic Photography Course

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DOFMaster for Windows On-line Depth of Field Calculator DOFMaster for Mobile Devices On-line Depth of Field Table Hyperfocal Distance Chart Articles FAQ Recommended Books Support Contact Links Home As an Amazon Associate I earn from qualifying purchases.	contents <- previous page next page -> COUPLER 耶hemical compound in color developer that can react with the oxidized developing agent in the sensitized material to form a dye color. CRITICAL FOCUS 茅hat point of focus at which resolution is at its maximum. (NMA) CROP 茅o trim or cut off parts of the picture by printing methods to eliminate superfluous portions, and thus improve the composition. CROP MARKS 胞arkings placed on original copy, indicating where part of the top, bottom, or sides of the picture are to be omitted. CURVATURE OF FIELD 耍n aberration of a lens that causes the image of a plane to be focused into a curved surface instead of into a plane. CUTAWAYS (MOTION PICTURE) 范hots of related and previously established outside interest used to divert the audience attention in order to cover jumps in action, screen-direction changes, and passage of time. D-LOG E CURVE范ee CHARACTERISTIC CURVE. DARK SLIDE 茅he opaque slide that covers the film in a film holder, plate holder, film pack, or film magazine. AI-5 DARKROOM 耍 room in which all light of color quality not safe for undeveloped sensitized materials has been excluded. It is used for loading and unloading and the developing of exposed photographic film or paper. DENSITOMETER 胖evice to measure the optical density of an image or base by measuring the amount of incident light reflected or transmitted. (NABDC) DENSITY 茅he light-absorbing quality of a photo- graphic image is usually expressed as the logarithm of the opacity. Several specific types of density values for a photograph may be expressed; however diffuse transmission density is one of the most important for photographic transparency materials, such as negatives. Diffuse reflection density is generally of interest for photographic prints. DEPTH 背n a nonstereoscopic picture, an illusion of three-dimensional space that is sometimes created by a combination of favorable lighting and coloring of the set and favorable viewing conditions for the reproduction. DEPTH OF FIELD 茅he distance between the points nearest and farthest from the camera that are acceptably sharp at a given lens setting. DEPTH OF FOCUS 茅he allowable error in lens- to-film distance within which an acceptably sharp image of the subject focused upon will still be obtained. DEVELOPER (CHEMICAL) 耍 chemical reagent used to produce a visible image on an exposed photographic layer. DEVELOPER, COLOR 耍 photographic developing solution capable of reducing silver halides with the simultaneous production of an insoluble colored oxidation product in the regions where silver is deposited. DEVELOPING AGENT 耶hemicals used in the photographic processing baths to convert the latent image into a visible and photographically useful image. DIAPHRAGM 耍 device, such as a perforated plate or an iris, that limits either the aperture of the lens, the field covered by the lens, or both, depending upon its location. DICHROIC FOG 耍 deposit of colloidal silver on a photographic film caused by improper processing. This deposit commonly appears red by transmitted light and greenish by reflected light. DIFFRACTION (OPTICS) 茅he bending of light waves around the edges of opaque objects. DIFFUSER 胖evice for obtaining diffuse direct illumination, such as a wire screen, piece of cloth, or translucent membrane, placed between a light source and the subject illuminated. DIFFUSION �(l) (Optical) The scattering of light rays so as to cause the light falling on a surface or passing through an aperture to be coming from all directions in contrast to the regular radiation of light from a point source. Diffusion may be introduced by reflection from a matte surface, by transmission through a frosted or opal glass, or by the use of an integrating bar. When diffusion is complete, a sharp image of the light source can no longer be seen, and its place is taken by a uniform, extended source that emits light equally in all directions. (2) (Chemical) The migration of molecules or ions in a solution tending to reduce a difference in concentration between two adjacent regions. contents Basic Photography Course <- previous page next page ->	As an Amazon Associate I earn from qualifying purchases.
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