Abstract

Psychometric methods were used to evaluate the relative sharpness of a number of photographic reproductions in which sharpness was the only significant variable. Since sharpness is an observer’s subjective impression of an aspect of picture definition, the methods for deriving sharpness values involve introspective processes and methods of quantifying these subjective impressions. Although no physical measurements of any aspect of the stimulus are involved in deriving sharpness values by the psychometric method, repeated evaluations showed that the scale values obtained are a reliable indication of the sharpness attribute of a photographic reproduction. Three methods of quantifying the judgment data were used, and the sharpness ratings obtained from all three were in good agreement with one another. Projected transparencies gave. substantially the same results as paper enlargements. Attempts to correlate the sharpness ratings with physical measurements of some aspect of the developed image were not entirely successful; neither resolving power nor simple density relationships across an abrupt boundary between light and dark areas resulted in satisfactory correlations with sharpness ratings.

© 1953 Optical Society of America

Errata: Psychometric Evaluation of the Sharpness of Photographic Reproductions

Robert N. Wolfe and Fred C. Eisen
J. Opt. Soc. Am. 43(12) 1231_10-1231 (1953)

The Relation of Definition to Sharpness and Resolving Power in a Photographic System*

George C. Higgins and Robert N. Wolfe
J. Opt. Soc. Am. 45(2) 121-129 (1955)

Assessment of Sharpness and Over-All Picture Quality by Different Psychometric Methods

S. C. Som and A. K. Ghosh
J. Opt. Soc. Am. 56(1) 44-48 (1966)

A New Approach to the Evaluation of the Performance of Photographic Lenses

Frank G. Back
J. Opt. Soc. Am. 43(8) 685-689 (1953)

Concerning Photographic Grain, Signal-to-Noise Ratio, and Information

Peter Fellgett
J. Opt. Soc. Am. 43(4) 271-282 (1953)