Toward a more accurate and extensible colorimetry. Part V. Testing visually matching pairs of lights for possible rod participation on the Aguilar-Stiles model
✍ Scribed by William A. Thornton; Hugh S. Fairman
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 267 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0361-2317
No coin nor oath required. For personal study only.
✦ Synopsis
The spectral power distributions of strongly
INTRODUCTION metameric visually matching pairs of lights, at visual
Parts I-III 1-3 described the visual colorimeter-spectrorafields of 10Њ and 1.3Њ and luminances from 0.2-120 cd/ diometer and the resulting accurate absolute spectral m 2 , are examined for possible rod participation, on the power distributions (SPDs) of all viewed lights. That Aguilar-Stiles model, in the visual matches. We develop early work utilized bipartite (top and bottom) 10Њ visual a method for computing visual jnds of predicted rod intrufields, natural pupil, dim surround, binocular viewing, sion; i.e., an analytical expression for rod mismatch. With and adaptation to a steady match-point. Both maximumthis, we compute possible rod mismatch for 922 metasaturation (Ref. 1, Fig. ; variable light / one primary meric pairs of lights, each pair pronounced a visual match in the top field, other two primaries in the bottom field) by one or another of eight normal observers, by using the and Maxwell method visual matches (Ref. 1, Fig. ; vari-Trezona expression for pupil diameter or by arbitrarily able light and two primaries in the top field, white referassigning pupil diameters of 4, 6, 8, or 10 mm. We find ence light in the bottom field) were used. The Maxwell some evidence of possible rod participation in the matches utilized white-field brightnesses equivalent to 6matches, under certain conditions, in small parts of the 37 cd/m 2 , while the maximum-saturation matches in-(brightness) -(fieldsize) -(spectral composition) threevolve highly colored fields whose luminance (of violet space. On the Aguilar-Stiles model, rod participation is fields, for example) was as low as 0.2 cd/m 2 . Large tristinot an appreciable contributor to the troublesome tristimmulus errors (differences between tristimulus values ulus errors documented, in earlier parts of this series of computed by the 1964 CIE Standard Observer for memarticles, to be present at high and low field brightness and at large (10Њ) and small (1.3Њ) visual fields. ᭧ 1998 bers of a pair of visually matching lights) were docu-