Abstract

The Staggered Position One Angle method of preparing color separations does not adjust the dot angle for each color. The dot pattern is staggered horizontally or vertically by half a row of dots for each separation maintaining the same angle. The investigation compared the Staggered Position method to the four angle method and to the dot-on-dot method. Newsprint was the substrate, and 65, 85, and 100 lines per inch were the rulings. Experienced judges viewed the representative prints and scored each for sharpness, color variability, and overall acceptance. They were also asked to indicate the evidence of rosette and moire patterns. Densitometric and spectrophotometer readings were used for objective analysis. The judges found the Staggered Position to be equal or better than both four angle and dot-on-dot printing in most instances. A non existant rosette pattern and a minimal risk of moire' patterns also resulted. The Staggered Position printing excelled in the ability to produce a sharp reproduction, and its tone reproduction was found to be equivalent to the four angle and dot-on-dot printing. The use of Delta E for the visual rejection or acceptance of an image was found not to be a good indicator in this particular study. The study opens up a number of areas for further research into this new separation method, but because of its good performance on newsprint, it should be considered as an alternative to the four angle method for newspapers.

Library of Congress Subject Headings

Photomechanical processes--Evaluation; Color printing--Technique--Evaluation; Color separation--Technique--Evaluation

Publication Date

10-1-1988

Document Type

Thesis

Department, Program, or Center

School of Print Media (CIAS)

Advisor

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: TR977 .R524 1988

Campus

RIT – Main Campus

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