Dolby-3D: Describes a 3D projection method, which without special silver screen (for low light scattering) and thus significantly reduces the costs for operators. Technology: A special filter is installed in front of the projector, which can also be removed for normal 2D reproduction. The spectators wear special passive glasses for the 3D effect.
These glasses are more expensive than polarization filter glasses and are therefore usually rented out by the cinemas, cleaned after use and used several times. The technology for the 3D effect is called interference filter technology and was licensed by Dolby from the German company Infitec GmbH.
The light filter separates the light of the primary colors red, green and blue into two different wavelengths, for example:
Left Eye: Red 629nm, Green 532nm, Blue 446nm
Right Eye: Red 615nm, Green 518nm, Blue 432nm
Selective interference filters in the glasses ensure that each eye only sees a triplet of primary colors. The differences in the color perception for the left and right eye caused by the deviation of the primary colors are compensated for by digital color correction before projection in order to achieve a subjective adjustment.