Abstract

The relationship between colorimetric purity of the stimulus and saturation of the color evoked under specified observing conditions has been determined for yellow colors by using the yellow series of Lovibond glasses (dominant wave-length about 575 ). Two observers have selected glasses from this series requisite to produce a scale progressing by equal steps from white to yellow. The step size varied from something approaching the least perceptible in one determination to about four times that size in another; it was found that this variation produced no significant change in the shape of the curve connecting purity and saturation. An increase in step size by an additional factor of three was tested for five observers. It was found chiefly to introduce greater individual difference; the average for all observers was not significantly changed. It is concluded that the integral of the sensibility to purity change from zero purity may safely be taken as the saturation of the yellow color evoked under the present observing conditions. The saturation-purity curve resulting from these determinations is compared with that from previous experimental data and with those from two empirical relations. In order to discover whether the discrepancies revealed by this comparison are ascribable to individual difference, groups of glasses representing each of four curves compared were selected and judgments obtained from eight observers with the result that the experimental scale was corroborated. The individual differences shown among these eight observers were too slight to account for the discrepancy. It is concluded that an empirical relation which was previously found fairly well justified by data on other types (wave-length, color-temperature) of chromaticity sensibility, though not perfect, yields a saturation scale for yellow which is close to the true one.

© 1933 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
CHROMATICITY SENSIBILITY TO STIMULUS DIFFERENCES

DEANE B. JUDD
J. Opt. Soc. Am. 22(2) 72-72 (1932)

A Comparison of Three Methods for Color Scaling*

Rita M. Halsey
J. Opt. Soc. Am. 44(3) 199-206 (1954)

Scaling perceived saturation

R. Cao, M. Castle, W. Sawatwarakul, M. Fairchild, R. Kuehni, and R. Shamey
J. Opt. Soc. Am. A 31(8) 1773-1781 (2014)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (1)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription