  Color encoding of depth is shown to occur naturally in holograms that are
reconstructed under white light illumination. It can be registered in a common
color photograph, allowing a simple method of visual decoding by means of
ordinary colored 3-D spectacles. The fundamental holographic equations and the
photographic procedure required for maximum fidelity in three-dimensional
reproduction are described. The result is a new kind of photograph that shows
all of the views of the object in a continuous sequence. It permits an animated
photographic representation and also makes it possible to adjust the degree of
depth visualization when observed as a stereoscopic representation.
