Photocopying – Contact printing – Multicolor printing
Patent
1984-07-18
1986-04-22
Wintercorn, Richard A.
Photocopying
Contact printing
Multicolor printing
355 95, 355102, G03B 2704
Patent
active
045838496
ABSTRACT:
Methods and apparatus are provided for producing a set of color correction masks on a single piece of masking film, or a set of color separation negatives on a single piece of separation negative film. The set of masks or set of negatives may be exposed so that each entire set may be developed simultaneously under identical development conditions. This is accomplished by determining a development time which provides substantially identical or other desired contrast indices for all of the masks or negatives in a set. The exposure time required for each mask or negative in the set is then determined so that the color components of the exposures will be balanced in the manner desired when the exposures are developed for the predetermined development time. The exposures may then be made in the apparatus provided for that purpose.
The apparatus of the invention includes means for rotating a slide transparency and an opaque shield to expose four quadrants of a single piece of film in sequence. The slide is preferably maintained in contact with the film during each exposure.
The color correction masks are normally made first, and are used in the process of making the separation negatives. Means are provided in the apparatus for maintaining the correction masks in proper registration with the slide transparency so that properly filtered light to which the negatives are exposed passes through an appropriate mask before it passes through the slide transparency to the negative film.
The entire exposure process and apparatus may be automatically controlled, if desired, so that an entire set of masks or negatives may be made in sequence without interruptions or adjustments.
REFERENCES:
patent: 3801198 (1974-04-01), David
patent: 4110036 (1978-08-01), Guillaume
Kodak, "Kodak Photographic Materials for the Graphic Arts, Films, Glass Plates, Papers", published 1967.
Kodak, "Color Separation and Color Masking a Kodak Color Data Book", published 1951, 56 page book.
Kodak, "Masking Color Transparencies for Photomechanical Reproduction", published 1960, 59 page book.
Berkey Technical, "Berkey Graphic Master", 12 page brochure.
R. W. Borrowdale Co., "Borrowdale", 2 page brochure.
DuPont, "The Contact Screen Story", 97 page book.
Miles Southworth, "Developments Promise Big Cuts in Photo Separation Costs", Oct. 1978, 1 page article.
Zelacolor, "The Zelacolor System General Description", 2 page brochure.
Zelacolor, "The Zelacolor System, A New Era in Reproduction General Description", 4 page brochure.
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