APPARATUS FOR AUTOMATIC HALF-TONE (DIRECT-SCREEN) OR CONTINUOUS TONE COLOUR SEPARATION WORK IN PHOTOMECHANICAL REPRODUCTION

摘要

Apparatus for making color separation negatives comprises a photographic enlarger mounted on a light-tight casing. The enlarger comprises a film holder plate for receiving a color film, a lens system, a diaphragm and a shutter. A light source is provided above the film holder plate and means is provided for inserting interchangeable color filters between the light source and the film. A film holder table in the casing receives a single sheet of film large enough for four separation negatives and is movable so as to present the four quarters of the film sheet successively to the enlarger. The movement of the film holder table, the filter selection, the diaphragm opening and the shutter timing are all automatically controlled to make four separation negatives successively on the same film sheet. The exposure of the film can be modified by a timed exposure to an auxiliary light movable momentarily into position over the respective quarter of the film sheet.