Gretag Imaging Ag

Gretag Systems, Inc.

Karl Ursprung

Walter Kraft

Beat Frick

In a method for producing index prints from photographic originals, each of the photographic originals is photoelectrically scanned in a scanning station of a photographic printer by a color- sensitive scanning system of low to medium local resolution in a plurality of first scanning regions. Using the scanning data, a digital color data set is determined for each original, with the aid of which set a digital representation of the picture content of the original is prepared for each original. The individual digital representations are grouped into a digital composite picture, from which an index print can be produced by an output device. The originals are also photoelectrically scanned in a scanning station by a locally high-resolution density scanner in a plurality of second scanning regions. From the scanning data of the density scanner, a digital density data set for each original is determined, which includes density data representative of the original and which has a higher local resolution than the color data set. In producing the digital representation of the picture content of the respective photographic original, both the associated color data set and the associated density data set are used.

Method for producing index prints

The light emitted by a source of light is passed by means of optical fibers or bundles of optical fibers in lines over a master to be scanned. In the process, an orifice of a disk rotated by a motor sequentially projects the light onto one optical fiber or bundle of fibers leading to the master. The light exiting from the light emitting end of the optical fiber or bundle of optical fiber illuminates the master. On the other side of the master a corresponding optical fiber or bundle of fibers receives the light coming from the master and conducts it to a receiver.

Growing community of inventors

Oberhasli, Switzerland

Karl Ursprung