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Modeling The Yule-Nielsen Halftone Effect, Jonathan Arney, Charles Arney, Peter Engeldrum
Modeling The Yule-Nielsen Halftone Effect, Jonathan Arney, Charles Arney, Peter Engeldrum
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The Yule-Nielsen effect, also called optical dot gain, is a nonlinear relationship between the reflectance of a halftone image and the fractional dot area of the halftone dots. Two models of the Yule-Nielsen effect are examined. The first is an empirical model previously described in the literature, and the second is an a priori model derived for an idealized halftone line system in one spatial dimension. Both are shown to model halftone behavior well. By combining the two models we derive that a semiempirical function establishes a simple connection between the magnitude of the Yule-Nielsen effect and independently measurable scattering …
Making A Streak Camera, Andrew Davidhazy
Making A Streak Camera, Andrew Davidhazy
Articles
This was my first "technical" article that was published in a professional journal and it came about mostly through the encouragement of Dr. Richard Zakia in the early 1960's for whom I prepared this work as a student project and who subsequently encouraged me to submit it to PMI magazine and William Hyzer for publication consideration.