DIGITAL VTR–A videotape recorder that translates
and records the analog video signal in digital form.
DIRECT POSITIVE–A positive image obtained
directly from another positive image without the use
of a negative.
DODGING–A printing technique in which certain areas
being exposed are temporarily shielded, thereby
producing a different exposure than that used for the
rest of the print.
DROPOUT–A loss of part of the video signal that
appears as white glitches. Caused by dirty VTR
heads or poor quality videotape.
DRY MOUNTING–A method for mounting
photographs or artwork on a support by means of a
thermosetting laminate that is heated to effect a
bond. (PIA)
DRYING MARK–Spots or streaks on negatives and
prints differing in density from the surrounding
area, produced by uneven drying of the film during
processing.
DUB–Duplication of an electronic recording, either tape
to tape, record to tape, or vise versa. Dub is always
one generation away from the original recording.
EKTACHROME–A trademark of Eastman Kodak
Company for a multilayer reversal color film in
which couplers are incorporated in the emulsion
layers that form dyes in the emulsion during
processing.
EKTACOLOR–A trademark of Eastman Kodak
Company for a multilayer color negative film in
which dye couplers are incorporated in the emulsion
layers which upon development produce dye
images complimentary to the object colors. Unused
couplers remaining in the emulsion after
development provide automatic masking for
correction.
ELECTROMAGNETIC SPECTRUM–The entire
range of wavelengths, extending from the shortest
to the longest or conversely, that can be generated
physically. This range of electromagnetic
wavelengths extends almost from zero to infinity
and includes the visible portion of the spectrum
known as light.
EMULSION (SILVER HALIDE)–A suspension of
light-sensitive silver salt, especially silver chloride
or silver bromide, in a colloidal medium, usually
gelatin, used for coating photographic film, plates,
or papers.
EMULSION SIDE–That side of a (single coated)
photographic film on which the emulsion has been
coated
EMULSION SPEED–A comparative measure for a
given emulsion of exposure to light required to
produce a correctly exposed image.
ENLARGEMENT –A print made from a smaller
negative through a projection process.
ENLARGER–A photographic projection printer. (PIA)
EXHAUSTION–The state of depletion reached by a
processing solution due to age or use that makes it
incapable of producing satisfactory results. (PIA)
EXPIRATION DATE–A date placed on sensitized
photographic material packaged by the
manufacturers to limit the period during which it is
warranted to produce normal results.
EXPLODED VIEW–A photograph showing the
correct sequence and relationship of the various
parts of an assembly. Also called an exploded
photograph.
EXPOSURE–(l) The act of exposing a light-sensitive
material to a light source. (2) A section of a film for
an individual exposure, as a roll containing six
exposures. (3) The time during which a sensitive
surface is exposed, as an exposure of 2 seconds.
(4) The product of light intensity and the time
during which it acts on a film, plate, or paper.
EXPOSURE INDEX–An exposure index is the rating
of a film for use in connection with exposure tables,
exposure computers, and exposure meters.
EXTENSION TUBE–A device used to increase the
lens-to-film distance for extreme closeup photog-
raphy.
FAHRENHEIT–A thermometer scale, on which, under
standard atmospheric pressure, the freezing point of
water is 32 degrees, and the boiling point of water
is 212 degrees; usually indicated as 32°F and 212°F.
Fahrenheit temperatures may be converted to
Centigrade temperatures with the following
formula:
C = 5/9 (F - 32)
when C = Centigrade temperature and F = Fahren-
heit temperature. (PIA)
FAST–Having a high-photographic speed. The term
may be applied to a photographic process as a
whole, or it may refer to any element in such a
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