Movies for TV - Early Television Foundation

COLOR 775
color film is seldom used for television or semi-professional 16
mm work. The integral tripack film is so much more convenient
and easy.
Kodachrome
The best known film for color work is probably Kodachrome,
followed closely by Ansco Color. Both films can be obtained for
daylight and artificial light use. Kodachrome "commercial" posi-
tive film is described as "commercial" stock because it is used for
making films which have to be duplicated a number of times; it
produces a low contrast positive color image. Kodachrome and
Ansco Color both are reversal films and work the same way as do
the ordinary black and white reversal film except that they are
more complicated.
"Commercial" film consists of three layers of emulsions, the
bottom is red-sensitive, the top blue-sensitive, and the middle
green-sensitive. Between the blue and green emulsion is a yellow
filter to prevent blue from reaching the other layers. Due to the
built-in filter effect, three images are produced, each one lacking
some colors: the bottom image, on the red-sensitive emulsion, is
cyan (minus red) ; the middle is a magenta (minus green) ; and
a yellow image is on the top layer.
Reversal Kodachrome Type A and daylight films are similar
in principle. The only difference between the two emulsions is in
the fact that daylight is balanced for sunlight exposure and Type
A for use with photoflood lamps and other forms of artificial light.
These films also use the subtractive method for color production.
The emulsions are the same as for "commercial." The treatment
during development is also similar. After the initial development
when some fine emulsion grains still remain undeveloped, the film
is exposed to white light in the same way as black and white re-
versal film. A special dye is present in the developer for each layer
in this second development. This forms three different colored
layers. The same sequence of color layers is present and when
light is projected through the film the various minus colors, cyan