Holography
is a three-dimensional imaging technique. It uses laser
light to record the patterns of light waves reflected
from an object onto the emulsion of light sensitive film
(or glass plates). When that film is developed, and re-exposed
to laser light (or normal incandescent light like most
holograms today), it re-creates -- in space -- all the
points of light that originally came from the object.
The resulting image, either behind or in front of the
holographic film, has all the dimensions of the original
object and looks so real that you are tempted to reach
out and touch it -- only to find nothing there but focused
light.
Unlike photography or painting, holography can render
a subject with complete dimensional fidelity. A hologram
creates everything your eyes see -- depth, size, shape,
texture, and relative position – from many points
of view. In fact, the term "hologram" was coined
from the Greek words holos, meaning "whole,"
and gramma, meaning "message." |
