Paul Lewis


This investigation was aimed at establishing a relationship between the optical spread function of four common printing stocks (cast coat, enamel gloss, enamel dull and ledger) and a Yule - Neilsen n value in predicting physical dot Area, for offset lithographic printing. Using an offset press each paper stock was printed with a test target containing common screen frequencies at percent dot areas from 5-90"/. and solid ink patches adjacent to each tint. Using planimetry and macrodensitometry, exact n values were calculated for comparison with the measured spread function of that same paper stock. No relationship between the optical spread functions of the printing stocks and a Yule - Neilsen n value was found. Coated stocks (i.e., cast coat, enamel gloss and enamel dull) behaved differently than uncoated stock with respect to n values. This was found to be due to irregular ink coverage on the uncoated stock. n values were found to be screen frequency dependent.

Publication Date


Document Type


Department, Program, or Center

Chester F. Carlson Center for Imaging Science (COS)


Altman, Joe

Advisor/Committee Member

Engeldrum, Peter

Advisor/Committee Member

Francis, Ronald


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