CHROMAKEYAn electronic special effect that
combines two video sources into a composite
picture, creating the illusion that the two sources are
CIRCLE OF ILLUMINATIONThe total image area
of a lens, only part of which is actually used in taking
CLOSE-UP A photograph or a motion-picture scene
taken at a very close range that shows intimate detail
and captures and holds audience interest.
COATING, LENSA thin, transparent coating applied
to the surface of lenses or other optical parts to
COINCIDENCEAgreeing as to position. In a coinci-
dence type of range finder, when the two half
images of a distant object are in exact juxtaposition,
they are said to be in coincidence."
COLLIMATED A beam of light is said to be colli-
mated when all of its rays have been made parallel.
COLOR BALANCEThe relationship between the
three images composing a color negative or positive
that provides an accurate (or, more generally, the
most pleasing) reproduction of natural colors. (PIA)
COLOR BARSA color standard used by the television
industry for the alignment of cameras and videotape
COLOR CHARTTarget for test photography
composed of pigmented areas having colors of high
saturation, often accompanied by gray scales, and
useful in both color photography and in
black-and-white reproduction of colored objects.
An assembly of chromatic samples illustrating a
scheme of color classification. (PIA)
COLOR COMPENSATING FILTERA filter used to
change the overall color balance of photographic
results obtained with color film and to compensate
for deficiencies in the quality of the light when
printing color films.
COLOR TEMPERATUREThe temperature to which
a black body radiator must be raised in order that
the light it emits may match a given light source in
color; usually expressed in degrees Kelvin (°K).
COLOR TEMPERATURE METERAn instrument
for estimating the spectral quality of a light source
or the illumination on a scene and expressing the
value in terms of color temperature. (PIA)
COLOR TRANSPARENCYA positive image in
natural colors on a transparent support intended for
projection or for viewing by transmitted light. (PIA)
COLORBLIND Applied to photographic layers
having only natural silver halide sensitivity to blue,
violet, and ultraviolet rays. (PIA)
COMAAn aberration of a lens that causes oblique
pencils of light rays from an object point to be
imaged as a comet-shaped blur.
COMPONENTThe processing of RGB (red, green,
and blue) channels as three separate channels.
COMPOSITE SIGNAL (Y/C)(Also called NTSC
signal.) The video signal in which luminance Y
(black and white) and chrominance (red, green, and
blue) and sync information are encoded into a single
CONJUGATE DISTANCEThe distances of object
and image from the lens are called conjugate
distances. For every position that an object may
occupy with respect to a lens, there is a
corresponding position for the image.
CONTACT PRINTPrint produced by exposure in
immediate contact with the original or negative.
These prints are the same size as the original or
CONTAMINATION Foreign matter in a processing
solution which impairs its operation.
CONTINUOUS TONEPhotographs in which the
detail and tone values of the subject are reproduced
by an infinite gradation of gray densities between
white and black. (PIA)
CONTRAST, LOWA term expressing a relationship
of image tones in which highlights and shadows are
represented by very little difference in densities.
CONTRASTYPhotographic term applied to images
showing accentuated highlights and shadows. (PIA)
CONTROL TRACKThe area of the videotape used
for recording the synchronization information (sync
COPY(l) Any document or photograph to be
reproduced. (2) The results of such reproduction.
(3) (Verb) The act of reproducing a document.
COPYBOARD The board, frame, or other device for
holding copy to be photographed.
CORROSIONThe erosion of metals, as by the action
of an acid or an alkali; rusting; oxidation. (PIA)