Abstract

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 are encountered in color graininess and in most other applications of small-field color-discrimination data.

© 1959 Optical Society of America

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References

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    [Crossref]
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    [Crossref]
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    [Crossref] [PubMed]
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    [Crossref]
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1956 (1)

1955 (1)

1953 (1)

1950 (1)

1949 (2)

W. R. J. Brown and D. L. MacAdam, J. Opt. Soc. Am. 39, 808 (1949).
[Crossref] [PubMed]

G. N. Rautian and V. I. Demkina, Proc. Acad. Sci. U.S.S.R. 66, 859 (1949).

1944 (1)

D. L. MacAdam, J. Franklin Inst. 238, 195 (1944).
[Crossref]

1943 (2)

1942 (1)

1935 (1)

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Figures (4)

F. 1
F. 1

Constant luminance-discrimination ellipses (large: 3′ field, small: 4.4° field).

F. 2
F. 2

Constant luminance-discrimination ellipses for 3′ field (ellipses enlarged 3 1 3 times).

F. 3
F. 3

Constant luminance-discrimination ellipses for 4.4° field (ellipses enlarged 3 1 3 times).

F. 4
F. 4

Curvilinear CIE coordinate system on which constant luminance-discrimination ellipses for 3′ field are as nearly equal-size circles as possible in a plane.

Tables (1)

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Table I Coefficients of discrimination equation.

Equations (7)

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g 11 Δ x 2 + 2 g 12 Δ x Δ y + g 22 Δ y 2 + 2 g 13 Δ x Δ L + 2 g 23 Δ y Δ L + g 33 Δ L 2 = 1 ,
Δ L = 0.2 Δ log Y = Δ Y / 11.53 Y .
( X Y Z ) = ( a i k ) ( R G B ) ,
d R d S R = 1 L , d G d S G = 1 M
d B d S B = 1 N .
T = ( S L D 1 S M D 2 S N D 3 S L E 1 S M E 2 S N E 3 k L R k M G k N B ) ,
g i k = T C 1 T ,