Abstract

It is known that, for black-and-white materials, the threshold “graininess” of a random pattern of dots on a background of a different luminance varies in a uniform manner with the difference between the log luminance of the dot and that of the background. For similar samples prepared with dots of one color on a background of a different color, it was found that this relationship does not hold. Data are presented showing that a correlation exists between ΔE and graininess, where $\mathrm{\Delta }E=[{(\mathrm{\Delta }D)}^2+K{(\mathrm{\Delta }C)}^2{]}^{\frac{1}{2}}$. Here, ΔD is the log luminance difference and ΔC the chromaticity difference (as measured on a uniform chromaticity scale) between the dots and the background. As a preliminary to the main experiment, the visual brightness of the 48 samples was measured for a 2-degree field, and the corresponding luminance values were computed. All the differences were erratic and were within the limits of experimental error.

© 1956 Optical Society of America

Quantitative Relation between Chromaticity Differences and Luminance Differences*

Earl M. Lowry and James J. Depalma
J. Opt. Soc. Am. 48(11) 820-827 (1958)

Relation between Graininess and Granularity for Black-and-White Samples with Nonuniform Granularity Spectra*

Keith F. Stultz and Hans J. Zweig
J. Opt. Soc. Am. 49(7) 693-702 (1959)

Some Quantitative Aspects of an Opponent-Colors Theory. III. Changes in Brightness, Saturation, and Hue with Chromatic Adaptation

Dorothea Jameson and Leo M. Hurvich
J. Opt. Soc. Am. 46(6) 405-415 (1956)

Chromatic Significance of Spectrophotometric Errors

Thorne Shipley and Gordon L. Walker
J. Opt. Soc. Am. 46(12) 1052-1060 (1956)

Glass Color Standards for Maple Sirup*

B. A. Brice and Arthur Turner
J. Opt. Soc. Am. 46(4) 293-299 (1956)