Color proofing method and article
AssigneeEastman Kodak Company
InventorsJoseph H. Ambro, Lawrence E. Contois
Life of this patent
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Abstract
Electrophotographic color proofs of half-tone dot pattern images are made which closely simulate the dot gain of prints made with lithographic plates and liquid inks. In forming the color proof, a thin transparent plastic sheet having on one side an electrophotographic toner dot pattern image is laminated to a reflective support with the toner image side in contact with the support. A thicker transparent plastic sheet is laminated to the other side of the thin sheet. The resulting color proof comprising a toner dot pattern on a reflective support and covered by a thin transparent layer and a thicker transparent layer has an apparent increase in dot size which simulates that of a press print.
Claims10
A method of forming electrophotographic pre-press color proofs which simulate the appearance of press prints obtained by printing half-tone dot patterns with half-tone lithographic plates and liquid inks, which comprises:
- subjecting a photoconductive element to a series of exposures through half-tone color-separation transparencies which correspond to the half-tone lithographic plates to obtain electrophotographic latent images,
- developing each latent image sequentially and forming a composite color proof toner image on a thin transparent sheet,
- laminating to a reflective substrate the toner side of the thin transparent sheet bearing the developed image, and laminating to the other side of the thin transparent sheet a thicker transparent sheet;
- said thicker sheet having a uniform thickness of at least about 15 .mu.m and a refractive index of at least about 1.3, and said thin transparent sheet having a thickness no greater than 3 .mu.m.
A color proof comprising a reflective substrate, a composite color proof toner dot pattern on the substrate, a thin transparent layer laminated to the substrate and covering the entire composite dot pattern, and a thicker transparent layer laminated to the thin layer, the thicker layer having a thickness of at least about 15 .mu.m and a refractive index of at least about 1.3, and the thin transparent layer having a thickness no greater than 3 .mu.m.
Dependencies are inferred from the claim text.