imaging facilities are diffusion type of enlargers. Like
of the enlarging system. The lens used in a color enlarger
must be free of chromatic aberration; that is, it must be
a color-corrected lens.
color material. This is true when making the original
camera exposure, and it is also true when you are
printing color materials. In color printing equipment,
to balance the light source and by regulating the voltage
three color images in the negative. The exposure of these
three layers is manipulated by both exposure time and
The color or quality of light is altered by placing color
light source and the negative. Generally, dichroic filters
have replaced CP filters. Dichroic filters more
accurately control the light, and unlike gelatin filters, do
not fade over time. CC filters are placed between the
lens and the light-sensitive paper.
characteristic of color negative film; that is, film size,
manufacturer, film type, and film speed. For example,
the basic filter pack for 35mm Kodak Vericolor III
differs from the basic filter pack of 120 Kodak Vericolor
from the basic filter pack of 35mm Fuji color. The basic
Vericolor III. The basic filter pack for Kodacolor 100
differs from the basic filter pack of Kodacolor 400.
absorb ultraviolet radiation emitted by the light source.
intensity and color quality of a light source. As little as
a 5-volt variation in the normal operating range
(l00-125volts) can change the output of a lamp by about
regulators provide a constant voltage between 95 to 120
way they control the exposing light. They are the
three filtration controls that move yellow, cyan, and
Segments of the dichroic filters are moved in and out of
the exposing light beam on calibrated cams. This type
of filtration system provides accurate and repeatable
filter pack combinations.
heat. When a tungsten-halogen light source is used, the
color printer must have forced-air cooling fans in
addition to the heat-absorbing glass. An ultraviolet
absorber, such as a Kodak Wratten Filter No. 2B
(CP2B), must always be included in the light beam,
preferably above the negative. The most common type
of subtractive printer used in the Navy is the Chromega
your fingers can heat up and create a hot spot on the light
bulb, causing it to burn out. If you touch the bulb, clean
it with a soft cloth and isopropyl alcohol. Allow the bulb
to dry thoroughly before energizing.
expose color printing paper. This type of enlarger uses
Basic Photography Course