FAQs
Multigrams
A multigram is the generic term given to a hologram that combines two or more origi- nation techniques in the final image. A typical example would be the combination of a stereogram sequence with a diffractive pixel image.
An extension of this basic idea would be to include a "hidden image" element within the combination. A hidden image is usually a master hologram, encoded into the transfer hologram, so it can only be seen in laser light. When illuminated with laser light, an image can be seen to project out from the hologram and be visible on a surface.
Multigrams are generally used for very high security applications where anti-counter- feiting is paramount. They are quite costly to originate because their production involves several mastering stages. These holograms are almost exclusively produced by the embossing method.
