Due to the films' high 
contrast, they are superior to 
their negative counterparts in 
rendering terrain and 
vegetative textural detail. 
With proper spectral filtration 
water related analyses are 
possible [22, 23]. 
The Kodak and Agfa films are 
operationally different films. 
The Kodak emulsion is processed 
using the EA-5 process [7] 
while the Agfa film is 
processed in using E-6 [40]. As 
with the color negative films, 
production efficiency is an 
important factor considering 
that the production rate of the 
EA-5 process will enable 
processing speeds of up to 9 
ft. /min. , whereas with the E-6 
process production rate is 
approximately 2 ft. /min. 
Color Infrared films. Kodak 
manufacturers the only color 
infrared film available: the 
Aerochrome infrared 2443. It is 
a "false color" reversal 
emulsion designed for infrared 
spectral discrimination in 
agriculture, forestry, 
geologic, hydrologic and other 
environmental studies. Its 
spectral sensitivity ranges 
between 450 nm. and 900 nm. A 
minus blue filter is used to 
absorb the blue light to which 
all three emulsion layers are 
sensitive. 
Consistent color rendition with 
this film requires more 
technical expertise than with 
typical color positive or 
negative emulsions. The color 
balance of the three dye layers 
is affected by environmental 
storage, atmospheric haze, and 
processing variations, 
consequently strict 
sensitometric control and 
appropriate filtration is 
required for consistent color 
balance in the photography 
[24]. 
Given that the film has a 
reversal positive emulsion, 
contrast control in printing is 
not possible with electronic 
dodging contact printers. This 
situation can be averted by 
using the 2443 as a negative 
material [25]. Kodak does not 
support nor does it condone the 
processing of 2443 as a 
negative, mostly because of the 
lack of supporting data 
associated with the process*; 
however, the Ontario Centre for 
Remote Sensing has shown that 
the process is feasible and 
advantageous in certain 
applications [26, 27]. 
The most striking feature of 
the negative process is the 
color shift from a cyan-magenta 
predominance in the positive 
image to an orange-green cast 
in the negative printed image 
(Figure 9). Although the 
spectral sensitivity of the 
emulsion is not affected by the 
negative process there is some 
evidence to suggest the 
enhancement of certain 
features, which would be 
displayed as cyan in the 
positive process are rendered 
better as green in the negative 
process (Figure 10). 
765 
J.Cummings, Kodak, 
personal communication, 
Nov. 1989.