Abstract

A densitometric method of monitoring color variation during four-color offset lithographic press runs is proposed. Once an 'OK' press sheet has been approved for the run, a standard color reference is established with which successive sheet pulls can be compared. In order to develop an accurate and repeatable system for monitoring and controlling color variation, densitometric analysis of three color overprinted tints can be utilized. In relation to the OK sheet, changes in the three-filter density readings measured at specific points across successive press sheets, indicate the visual change in color hue and strength that occurs during the press run. This work suggests that offset printers could use the following color control technique: zero the densitometer on a seventy percent overprint control point or dark neutral image area of the OK sheet and compare the difference in density of the same point of any sample sheet. The difference will indicate the change in the amount of red, green and blue light being reflected from that point in the sample relative to the OK sheet and suggest the corrective action necessary to control color variability during the press run.

Library of Congress Subject Headings

Color printing--Technique--Evaluation; Offset lithography--Technique--Evaluation

Publication Date

4-1-1990

Document Type

Thesis

Department, Program, or Center

School of Print Media (CIAS)

Advisor

Eisner, William

Advisor/Committee Member

Southworth, Miles

Comments

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: Z258 .S63 1990

Campus

RIT – Main Campus

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