Abstract

The spectral chromaticity coordinates have been measured at intervals of 0.01µ between 0.41µ and 0.70µ by means of Wright’s colorimeter for one British observer and for eight Egyptian observers with normal color vision. The matching stimuli were spectral radiations of wavelengths 0.65µ, 0.53µ, and 0.46µ. The units were based on spectral lines 0.5825µ and 0.494µ (Wright’s system) to eliminate the effect of the yellow ocular pigmentation. Individual differences were noticed which were too large to be accounted for by experimental errors and may be due to differences in the visual mechanisms. The student <i>t</i> test was applied to examine the significance of the differences between the means of the coordinates of the Egyptian group and 4 British observers. No significant difference was found between the means of the red coordinates, but a highly significant difference was noticed in the blue and green coordinates. It was also noticed that the difference was in such a direction that the green was higher and the blue lower in the Egyptians than in the British. Comparison has also been made between the average Egyptian data with those of Wright, Guild, and Weaver; Abney; and the C.I.E. after the transformation of their data to Wright’s system.

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  2. A. König and C. Dieterici, Z. Psychol. Physiol. 4, 241 (1892).
  3. W. de W. Abney, Researches in Colour Vision (Longmans Green and Company, London, 1913).
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  5. K. S. Weaver, J. Opt. Soc. Am. 6, 527 (1922).
  6. J. Guild, Trans. Roy. Soc. A230, 149 (1931).
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  8. T. Smith and J. Guild, Trans. Opt. Soc. 33, 73 (1931–1932).
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  12. J Guild, Trans. Opt. Soc. 26, 93 and 135 (1924–1925).
  13. W. D. Wright, Te Measurement of Color (Adam Hilger Ltd., London, 1944).

Abney, W. de W.

W. de W. Abney, Researches in Colour Vision (Longmans Green and Company, London, 1913).

Dieterici, C.

A. König and C. Dieterici, Z. Psychol. Physiol. 4, 241 (1892).

Guild, J

J Guild, Trans. Opt. Soc. 26, 93 and 135 (1924–1925).

Guild, J.

J. Guild, Trans. Roy. Soc. A230, 149 (1931).

T. Smith and J. Guild, Trans. Opt. Soc. 33, 73 (1931–1932).

Ives, H. E.

H. E. Ives, J. Franklin Inst. 180, 673 (1915).

König, A.

A. König and C. Dieterici, Z. Psychol. Physiol. 4, 241 (1892).

Maxwell, C.

C. Maxwell, Scientific Papers 1, 410 (1860).

Nelson, J. H.

J. H. Nelson, Proc. Phys. Soc. (London) 49, 332 (1937).

Pitt, F. H. G.

W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. (London) 47, 205 (1935).

Smith, T.

T. Smith and J. Guild, Trans. Opt. Soc. 33, 73 (1931–1932).

Weaver, K. S.

K. S. Weaver, J. Opt. Soc. Am. 6, 527 (1922).

Wright, W. D.

W. D. Wright, Researches on Normal and Defective Color Vision (Henry Kimpton, London, 1946).

W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. (London) 47, 205 (1935).

W. D. Wright, Te Measurement of Color (Adam Hilger Ltd., London, 1944).

W. D. Wright, Trans. Opt. Soc. 29, 225 (1927–1928).

Other (13)

C. Maxwell, Scientific Papers 1, 410 (1860).

A. König and C. Dieterici, Z. Psychol. Physiol. 4, 241 (1892).

W. de W. Abney, Researches in Colour Vision (Longmans Green and Company, London, 1913).

H. E. Ives, J. Franklin Inst. 180, 673 (1915).

K. S. Weaver, J. Opt. Soc. Am. 6, 527 (1922).

J. Guild, Trans. Roy. Soc. A230, 149 (1931).

W. D. Wright, Trans. Opt. Soc. 29, 225 (1927–1928).

T. Smith and J. Guild, Trans. Opt. Soc. 33, 73 (1931–1932).

W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. (London) 47, 205 (1935).

J. H. Nelson, Proc. Phys. Soc. (London) 49, 332 (1937).

W. D. Wright, Researches on Normal and Defective Color Vision (Henry Kimpton, London, 1946).

J Guild, Trans. Opt. Soc. 26, 93 and 135 (1924–1925).

W. D. Wright, Te Measurement of Color (Adam Hilger Ltd., London, 1944).

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