A new screening technology from Artwork Systems, Concentric screening, was evaluated against conventional AM and FM Staccato screening. The main feature of Concentric screening is to have very small concentric white circles inside AM halftone dots. Test targets were used in order to get information about different aspects of screening, such as: sensitivity to changes in ink film thickness; color gamut size, particularly for pastel colors; and detail rendering. A comparison was made between AM, FM, and Concentric screening. The results indicate that Concentric tints are more resistant to ink variation than conventional AM screening. Thus, the dot gain stability behavior was closer to FM Screening than to AM screening when ink levels are increased. Regarding color gamut, although there were differences in the expected direction, conclusions are uncertain because of inking variability between the press runs. However, micro-photographs from tints indicate that high resolution screens (FM and Concentric) have a thinner layer of ink on the dots when compared to AM screening. This results in improved color saturation and insensitivity to inking changes. Finally, in terms of contrast and resolution, results show no visually significant differences between the different screenings.
Library of Congress Subject Headings
Screen process printing; Offset printing; Color printing--Evaluation
Department, Program, or Center
School of Media Sciences (CIAS)
Carvajal, Eugenio, "A comparison study of concentric screening versus conventional AM screening and FM screening in offset printing" (2006). Thesis. Rochester Institute of Technology. Accessed from
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