Basic Photography Course

HIGH CONTRAST

耍 term expressing a relationship

of image tones in which highlights and shadows are
represented by extreme differences of density.

HIGH KEY

耍 term applied to a photographic print or

subject consisting entirely of light tones with little
contrast; also applied to a method of lighting a
subject.

HIGHLIGHT

茅he bright parts of a picture or subject

that are rendered as dense areas in the negative and
by very low density in the print.

HUE

茅hat attribute of certain color perceptions in

respect to which they differ characteristically from
the gray of the same lightness and which permits
them to be classed as reddish, yellowish, greenish,
or bluish.

HYDROMETER

胃eneric term for various

instruments designed to determine the specific
gravity of liquids. (PIA)

HYDROQUINONE C

(OH)

耶ommon photo-

graphic developing agent para-dihydoxybenzene.

HYPERFOCAL DISTANCE

茅he distance from the

optical center of lens forward to the nearest plane in
acceptable focus when the lens is focused at infinity
distance.

AI-9

ILLUMINANCE

胎uminous flux incident per unit area

of a surface. Widely known as illumination.

IMAGE, LATENT

茅he invisible image produced by

the action of radiant energy on a photosensitive
surface. It may be made visible by the process of
photographic development.

IMAGE, NEGATIVE

耍 photographic image in which

the values of light and shade of the original subject
are represented in inverse order. In a negative, light
objects are represented by high densities and dark
objects are represented by low densities.

IMAGE, POSITIVE

耍 photographic image in which

the values of light and shade of the original subject
are represented in their natural order. In a positive,
light objects are represented by low densities and

dark objects are represented by high densities.

IMAGE PLANE

茅he plane in which the image lies or

is formed It is perpendicular to the axis of the lens.
A real image formed by a converging lens would be
visible upon a screen placed in this plane.

INCANDESCENT

胃lowing with heat, such as the

tungsten filament in an incandescent lamp.

LAMP HOUSE

茅hat portion of an enlarger, reader, or

projector that contains the light source and
condensers or mirror.

INCIDENCE

茅he act of falling upon or affecting, as

light upon a surface.

INFINITY

耍 distance so far removed from an observer

that the rays of light reflected to a lens from a point
at that distance may be regarded as parallel. A
distance setting on a camera-focusing scale.

INFRARED

致ertaining to or designating those rays

which lie just beyond the red end of the visible
spectrum. They are invisible and are detected by
their thermal, photoelectric, and photographic
effects. Their wavelengths are longer than those of
light and shorter than those of radio waves.

INTERNEGATIVE

耍n internegative film is a nega-

tive derived directly from a color reversal original
film. All other color-duplicating negatives derived
from any other than reversal film are known as
color-duplicating negatives regardless of the
generation.

INVERSE SQUARE LAW

茅he intensity of light

received at a point (irradiance) varies inversely as
the square of the distance from the source. The law
holds for relatively small sources only and is useful
in calculating photographic exposures. (PIA)

IRIS DIAPHRAGM

茅erm applied to the adjustable

aperture fitted into the barrel of the photographic
lenses and so-called because of the contraction of
the aperture resembles that of the iris (pupil) in the

human eye. It consists of a series of thin metal
tongues overlapping each other and fastened to a
ring on the lens barrel, the aperture made smaller or
larger by turning the ring. (PIA)

JOGGING

胚rame-by-frame advancement of

videotape.

KELVIN (袁)

胞easurement of the color of light in

degrees. Numerically, the Kelvin temperature is
equal to the Centigrade temperature plus 273
degrees.

KEY LIGHT

茅he main source of illumination on a

subject. (PIA)

LAMP, PHOTOFLOOD

耍 lamp designed to yield

brilliant diffuse illumination. These lamps are
generally short-lived. (NMA)

LAMP, REFLECTOR FLOOD

胎ight bulb with

self-contained silvered surface to act as a reflector.

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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 -> HIGH CONTRAST 耍 term expressing a relationship of image tones in which highlights and shadows are represented by extreme differences of density. HIGH KEY 耍 term applied to a photographic print or subject consisting entirely of light tones with little contrast; also applied to a method of lighting a subject. HIGHLIGHT 茅he bright parts of a picture or subject that are rendered as dense areas in the negative and by very low density in the print. HUE 茅hat attribute of certain color perceptions in respect to which they differ characteristically from the gray of the same lightness and which permits them to be classed as reddish, yellowish, greenish, or bluish. HYDROMETER 胃eneric term for various instruments designed to determine the specific gravity of liquids. (PIA) HYDROQUINONE C 6 H 4 (OH) 2 耶ommon photo- graphic developing agent para-dihydoxybenzene. HYPERFOCAL DISTANCE 茅he distance from the optical center of lens forward to the nearest plane in acceptable focus when the lens is focused at infinity distance. AI-9 ILLUMINANCE 胎uminous flux incident per unit area of a surface. Widely known as illumination. IMAGE, LATENT 茅he invisible image produced by the action of radiant energy on a photosensitive surface. It may be made visible by the process of photographic development. IMAGE, NEGATIVE 耍 photographic image in which the values of light and shade of the original subject are represented in inverse order. In a negative, light objects are represented by high densities and dark objects are represented by low densities. IMAGE, POSITIVE 耍 photographic image in which the values of light and shade of the original subject are represented in their natural order. In a positive, light objects are represented by low densities and dark objects are represented by high densities. IMAGE PLANE 茅he plane in which the image lies or is formed It is perpendicular to the axis of the lens. A real image formed by a converging lens would be visible upon a screen placed in this plane. INCANDESCENT 胃lowing with heat, such as the tungsten filament in an incandescent lamp. LAMP HOUSE 茅hat portion of an enlarger, reader, or projector that contains the light source and condensers or mirror. INCIDENCE 茅he act of falling upon or affecting, as light upon a surface. INFINITY 耍 distance so far removed from an observer that the rays of light reflected to a lens from a point at that distance may be regarded as parallel. A distance setting on a camera-focusing scale. INFRARED 致ertaining to or designating those rays which lie just beyond the red end of the visible spectrum. They are invisible and are detected by their thermal, photoelectric, and photographic effects. Their wavelengths are longer than those of light and shorter than those of radio waves. INTERNEGATIVE 耍n internegative film is a nega- tive derived directly from a color reversal original film. All other color-duplicating negatives derived from any other than reversal film are known as color-duplicating negatives regardless of the generation. INVERSE SQUARE LAW 茅he intensity of light received at a point (irradiance) varies inversely as the square of the distance from the source. The law holds for relatively small sources only and is useful in calculating photographic exposures. (PIA) IRIS DIAPHRAGM 茅erm applied to the adjustable aperture fitted into the barrel of the photographic lenses and so-called because of the contraction of the aperture resembles that of the iris (pupil) in the human eye. It consists of a series of thin metal tongues overlapping each other and fastened to a ring on the lens barrel, the aperture made smaller or larger by turning the ring. (PIA) JOGGING 胚rame-by-frame advancement of videotape. KELVIN (袁) 胞easurement of the color of light in degrees. Numerically, the Kelvin temperature is equal to the Centigrade temperature plus 273 degrees. KEY LIGHT 茅he main source of illumination on a subject. (PIA) LAMP, PHOTOFLOOD 耍 lamp designed to yield brilliant diffuse illumination. These lamps are generally short-lived. (NMA) LAMP, REFLECTOR FLOOD 胎ight bulb with self-contained silvered surface to act as a reflector. contents Basic Photography Course <- previous page next page ->	As an Amazon Associate I earn from qualifying purchases.
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