The evaluation of the noticeability of chromaticity differences between very small areas is needed in studies of color graininess. In the present work, color-discrimination data for eleven well-selected chromaticities were determined by a single observer using a matching method for fields subtending (a) 3′ and (b) 4.4°. The data for the large field agree fairly well with those previously published. The comparable results for the 3′ field have been summarized for convenience in the form of a plane uniform chromaticity diagram in which the standard CIE coordinate network is curvilinear. The diagram represents a simplified approximation to the actual results, which would require a curved surface for accurate representation. Nevertheless, the present diagram is suitable for evaluating the large chromaticity differences that areencountered in color graininess and in most other applications of small-field color-discrimination data.

© 1959 Optical Society of America

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
Log in to access OSA Member Subscription

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
Log in to access OSA Member Subscription