Abstract

The purpose of this research is to measure the amount of image quality loss due to the effect of screening an image with halftone screens. This was done by using screens of different line number and images with differing amounts of image quality. Six black and white continuous tone positive originals were used to scale the image quality. These prints had been produced so as to have equal steps of image quality from the sharpest and ranging to some lower image quality which was at or slightly below a just acceptable level of image quality. Each of these images was then screened by contact screens with rulings of 85, 100, 133, 150, and 200 lines per inch. Each image was viewed by a panel of judges using the method of categories. This was the method by which the relationship between screen ruling number and image quality was determined. The conclusions were that image quality of the original was the most important factor in the quality reproduction. The relation between input and output image quality was linear in terms of overall image quality of black and white halftone prints. Next important factor in the quality reproduction was the ink density in shadow areas, The 133 line screen prints had better quality than that of the 200 line screen on the average because of this factor. Screen ruling was a minor important factor in the quality reproduction. The screen rulings from 100 to 200 lines per inch did not have so much effect toward image quality. In contrast, the screen rulings below 100 lines per inch made the quality drop noticeably.

Library of Congress Subject Headings

Photoengraving--Halftone processes; Photomechanical processes; Photography--Printing processes

Publication Date

1-1-1984

Document Type

Thesis

Student Type

Graduate

Degree Name

Print Media (MS)

Department, Program, or Center

School of Print Media (CIAS)

Advisor

Edward Granger

Comments

Physical copy available from RIT's Wallace Library at TR975 .T349 1984

Campus

RIT – Main Campus

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