Abstract

Wavelength discrimination was measured from 480 to 660 nm using wavelength-modulated square-wave gratings. When adjacent grating bars are matched in brightness, wavelength-difference thresholds in all regions of the spectrum increase with spatial frequency within the range of 2.4–19.9 cycles per degree (cpd). Unlike luminance-modulated gratings, no sign of low-frequency attenuation was found. Wavelength differences alone do not yield good visual acuity. Small brightness mismatches between adjacent grating bars generally improve wavelength discrimination and cause low-frequency attenuation in the wavelength modulation vs spatial-frequency function so that it resembles conventional luminance modulation vs spatial-frequency functions.

© 1970 Optical Society of America

Wavelength Discrimination in the Presence of Added Chromatic Fields*

Joel Pokorny and Vivianne C. Smith
J. Opt. Soc. Am. 60(4) 562-569 (1970)

Influence of luminance contrast on hue discrimination

R. L. Hilz, G. Huppmann, and C. R. Cavonius
J. Opt. Soc. Am. 64(6) 763-766 (1974)

Influence of the target size on the detection threshold for luminance and chromaticity contrast

Cornells Noorlander, Mathijs J. G. Heuts, and Jan J. Koenderink
J. Opt. Soc. Am. 70(9) 1116-1121 (1980)

Chromaticity discrimination: effects of luminance contrast and spatial frequency

A. E. Elsner, Joel Pokorny, and Stephen A. Burns
J. Opt. Soc. Am. A 3(7) 916-920 (1986)

Fourier Analysis and Color Discrimination*

Gerard J. C. van der Horst
J. Opt. Soc. Am. 59(12) 1670-1676 (1969)