The problem of predicting and previsualizing the distortions and aberrations in a holographic image is discussed,
particularly for the case of pictorial, or display holograms. The mathematical procedure for predicting these
attributes is outlined, followed by a brief outline of a computer program (HoloPov), written in the POV-Ray
language, that can be used both to calculate these attributes and to display them. A brief outline is also given
of a graphical user interface produced to allow fast manipulation of input data.
Factors affecting the choice of producing wavelengths for recording true-color holograms are examined. It is argued that the choice of wavelengths is largely independent of the method used for recording and, in fact, largely independent of holography. It is shown that a large area of the CIE chart need not be covered and that, in fact, choosing wavelengths that cover a large area can have deleterious effects. A set of three wavelengths is proposed which, in principle, can produce true-color holograms of excellent quality. A convenient method of obtaining three acceptable wavelengths is discussed.
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