Answer:
CIR (color infrared) film, originally referred to as
camouflage-detection film because of its warfare
applications, differs from conventional color film
because its emulsion layers are sensitive to green,
red, and near-infrared radiation (0.5 micrometers to
0.9 micrometers). Used with a yellow filter to absorb
the blue light, this film provides sharp images and
penetrates haze at high altitudes. Color infrared film
also is referred to as false-color film.
Black-and-white panchromatic (B/W) film primarily
consists of a black-and-white negative material with a
sensitivity range comparable to that of the human eye.
It has good contrast and resolution with low
graininess and a wide exposure range.
Black-and-white infrared (BIR) film, with some
exceptions, is sensitive to the spectral region
encompassing 0.4 micrometers to 0.9 micrometers. It is
sometimes referred to as near-infrared film because it
utilizes only a narrow portion of the total infrared
spectrum (0.7 micrometers to 0.9 micrometers).
Natural color (also referred to as conventional or
normal color) film contains three emulsion layers
which are sensitive to blue, green, and red (the
threeprimary colors of the visible spectrum). This
film replicates colors as seen by the human eye. Color
film is a valuable image interpretation tool because
the human eye can discern a greater variety of color
tones than gray tones.
