c. Primary and Secondary Negatives.
In some cases, it may be
advantageous to have a "primary" standard negative for the most usual film-
subject-lighting
situation, plus
one or
more "secondary" negatives
representing other situations.
A basic enlarger filter pack should be
determined for each negative.
2.
Equipment Requirements.
To make color prints, you need certain equipment items.
Almost any photo
equipment used for black and white printing can be used.
However,
specifically designed equipment makes your job easier. Here we will discuss
the printer, voltage regulator, and filters necessary to make color prints.
a. Printer/Enlarger.
Any enlarger that is equipped with a tungsten
lamp, heat-absorbing glass, ultraviolet filter, and a means to hold printing
filters is acceptable for making color prints. The enlarger should have a
means of holding the filters between the lamp and negative. Color printing
(CP) filters are designed to be used in this position. If you use filters
below the lens, you must use color-compensating filters.
(1) Printers designed specifically for color printing have the
distinct advantage of dial-in filters. Dial-in filters make it much easier
to alter the filter pack than trying to work with separate sheets of filter
material.
(2) You should also have an assortment of lenses to cover different
sizes of negatives. Be sure the lens will cover the negative sharply to its
edges.
The lens focal length should be roughly equal to the diagonal
measurement of the negative.
No matter what lens you use, be sure it is
clean and free of fingerprints and dust.
b. Voltage Regulator.
Stable, unfluctuating voltage is a must.
Fluctuations in the line voltage to a tungsten lamp changes the output and
color quality of the lamp. Although this is not serious in black and white
printing, it is sometimes disastrous in color printing. A five-volt change
will cause a .10cc change in color balance.
To combat this situation, you must use a voltage regulator. The best type
is the constant voltage transformer.
In the power line, this regulator
automatically evens out the voltage fluctuations.
The printers used here
have in-line constant voltage regulators.
c.
Printing Filters.
The major difference between black and
white
and color printing lies in the material.
In black and
white
work, you have only one image in one emulsion layer.
In
color
work, you have three emulsion layers and essentially three
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