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  1. An amplification of a paper presented at the Rochester meeting of the Optical Society of America, October 5, 1940, J. Opt. Soc. Am. 30, 657 (1940); see also S. M. Newhall, J. Opt. Soc. Am. 30, 619–620 (1940).
  2. Credited by Maxwell to Thomas Young, Scientific Papers of James Clark Maxwell (1890) Vol. 2, p. 272, reprinted from Proc. Roy. Inst. (1871).
  3. W. Uyterhoeven, Elektrische Gasentladungslampen (Julius Springer, 1938), Figs. 83, 84, pp. 168, 170.
  4. D. B. Judd, J. Opt. Soc. Am. 23, 364 (1933), Fig. 2.
  5. This scale factor varies not only from observer to observer—as will be evident from the existence of colorweak as well as color-blind observers—but from point to point on the retina of the same observer, as shown by the change in apparent hue in passing from the fovea to the periphery of the retina. J. W. Baird, The Color Sensitivity of the Peripheral Retina, Carnegie Institution of Washington Publication No. 29 (1905).
  6. Munsell Color Company, Inc., Baltimore, 1929.
  7. J. J. Glenn and J. T. Killian, J. Opt. Soc. Am. 30, 609–616 (1940).
  8. The standard symbol of the Illuminating Engineering Society for "reflection factor" is ρ. On that basis the quotients would be respectively ρx, ρy, and ρz; their differences ρx—ρyz—ρy;their ratios ρx/ ρyz/ ρy. X ≡ ∫Φλρλdλ/ ∫Φλdλ, XcρX ≡ ∫Φλρλdλ/ ∫Φλdλ,Y ≡ ∫Φλρλdλ/ ∫Φλdλ ≡ Yc ≡ ρY,Z ≡ ∫Φλρλdλ/ ∫Φλdλ, Zc ≡ ρZ ≡ ∫Φλρλdλ/ ∫Φλdλ. Xc, Yc and Zc are the mean ordinates obtained from spectrophotometric curves for reflection samples by the method of selected ordinates.
  9. It will be evident that this will be true for any other standard illuminant, and that any nearly neutral color will have nearly the same coordinates under various nearwhite illuminants (color-constancy).
  10. Cf. Fig. 1d, S. M. Newhall, J. Opt. Soc. Am. 30, 620 (1940), in which the Glenn-Killian tristimulus values have been plotted with a scale factor of 3.
  11. For a constant state of adaption, E. Q. Adams and P. W. Cobb, J. Exper. Psychol. 5, 39–45 (1922), derived the equation, S = B/(B+B0). For samples of finite size, and finite times of presentation, the state of adaption cannot be expected to be uninfluenced by the samples.
  12. A. E. O. Munsell, L. L. Sloan, and I. H. Godlove, J. Opt. Soc. Am. 23, 394, 419 (1933).
  13. Psychol. Rev. 36, 56–76 (1923), especially Fig. 1, p. 59.
  14. E. Q. Adams, "A Proposal for the Specification of Scotopic Luminosity," J. Opt. Soc. Am. 31, 757 (1941).
  15. S. M. Newhall, J. Opt. Soc. Am. 30, 639–42 (1940), Figs. 7 to 13.

1941 (1)

E. Q. Adams, "A Proposal for the Specification of Scotopic Luminosity," J. Opt. Soc. Am. 31, 757 (1941).

Adams, E. Q.

E. Q. Adams, "A Proposal for the Specification of Scotopic Luminosity," J. Opt. Soc. Am. 31, 757 (1941).

For a constant state of adaption, E. Q. Adams and P. W. Cobb, J. Exper. Psychol. 5, 39–45 (1922), derived the equation, S = B/(B+B0). For samples of finite size, and finite times of presentation, the state of adaption cannot be expected to be uninfluenced by the samples.

Baird, J. W.

This scale factor varies not only from observer to observer—as will be evident from the existence of colorweak as well as color-blind observers—but from point to point on the retina of the same observer, as shown by the change in apparent hue in passing from the fovea to the periphery of the retina. J. W. Baird, The Color Sensitivity of the Peripheral Retina, Carnegie Institution of Washington Publication No. 29 (1905).

Cobb, P. W.

For a constant state of adaption, E. Q. Adams and P. W. Cobb, J. Exper. Psychol. 5, 39–45 (1922), derived the equation, S = B/(B+B0). For samples of finite size, and finite times of presentation, the state of adaption cannot be expected to be uninfluenced by the samples.

Glenn, J. J.

J. J. Glenn and J. T. Killian, J. Opt. Soc. Am. 30, 609–616 (1940).

Godlove, I. H.

A. E. O. Munsell, L. L. Sloan, and I. H. Godlove, J. Opt. Soc. Am. 23, 394, 419 (1933).

Judd, D. B.

D. B. Judd, J. Opt. Soc. Am. 23, 364 (1933), Fig. 2.

Killian, J. T.

J. J. Glenn and J. T. Killian, J. Opt. Soc. Am. 30, 609–616 (1940).

Munsell, A. E. O.

A. E. O. Munsell, L. L. Sloan, and I. H. Godlove, J. Opt. Soc. Am. 23, 394, 419 (1933).

Newhall, S. M.

Cf. Fig. 1d, S. M. Newhall, J. Opt. Soc. Am. 30, 620 (1940), in which the Glenn-Killian tristimulus values have been plotted with a scale factor of 3.

S. M. Newhall, J. Opt. Soc. Am. 30, 639–42 (1940), Figs. 7 to 13.

Sloan, L. L.

A. E. O. Munsell, L. L. Sloan, and I. H. Godlove, J. Opt. Soc. Am. 23, 394, 419 (1933).

Uyterhoeven, W.

W. Uyterhoeven, Elektrische Gasentladungslampen (Julius Springer, 1938), Figs. 83, 84, pp. 168, 170.

J. Opt. Soc. Am. (1)

E. Q. Adams, "A Proposal for the Specification of Scotopic Luminosity," J. Opt. Soc. Am. 31, 757 (1941).

Other (14)

S. M. Newhall, J. Opt. Soc. Am. 30, 639–42 (1940), Figs. 7 to 13.

An amplification of a paper presented at the Rochester meeting of the Optical Society of America, October 5, 1940, J. Opt. Soc. Am. 30, 657 (1940); see also S. M. Newhall, J. Opt. Soc. Am. 30, 619–620 (1940).

Credited by Maxwell to Thomas Young, Scientific Papers of James Clark Maxwell (1890) Vol. 2, p. 272, reprinted from Proc. Roy. Inst. (1871).

W. Uyterhoeven, Elektrische Gasentladungslampen (Julius Springer, 1938), Figs. 83, 84, pp. 168, 170.

D. B. Judd, J. Opt. Soc. Am. 23, 364 (1933), Fig. 2.

This scale factor varies not only from observer to observer—as will be evident from the existence of colorweak as well as color-blind observers—but from point to point on the retina of the same observer, as shown by the change in apparent hue in passing from the fovea to the periphery of the retina. J. W. Baird, The Color Sensitivity of the Peripheral Retina, Carnegie Institution of Washington Publication No. 29 (1905).

Munsell Color Company, Inc., Baltimore, 1929.

J. J. Glenn and J. T. Killian, J. Opt. Soc. Am. 30, 609–616 (1940).

The standard symbol of the Illuminating Engineering Society for "reflection factor" is ρ. On that basis the quotients would be respectively ρx, ρy, and ρz; their differences ρx—ρyz—ρy;their ratios ρx/ ρyz/ ρy. X ≡ ∫Φλρλdλ/ ∫Φλdλ, XcρX ≡ ∫Φλρλdλ/ ∫Φλdλ,Y ≡ ∫Φλρλdλ/ ∫Φλdλ ≡ Yc ≡ ρY,Z ≡ ∫Φλρλdλ/ ∫Φλdλ, Zc ≡ ρZ ≡ ∫Φλρλdλ/ ∫Φλdλ. Xc, Yc and Zc are the mean ordinates obtained from spectrophotometric curves for reflection samples by the method of selected ordinates.

It will be evident that this will be true for any other standard illuminant, and that any nearly neutral color will have nearly the same coordinates under various nearwhite illuminants (color-constancy).

Cf. Fig. 1d, S. M. Newhall, J. Opt. Soc. Am. 30, 620 (1940), in which the Glenn-Killian tristimulus values have been plotted with a scale factor of 3.

For a constant state of adaption, E. Q. Adams and P. W. Cobb, J. Exper. Psychol. 5, 39–45 (1922), derived the equation, S = B/(B+B0). For samples of finite size, and finite times of presentation, the state of adaption cannot be expected to be uninfluenced by the samples.

A. E. O. Munsell, L. L. Sloan, and I. H. Godlove, J. Opt. Soc. Am. 23, 394, 419 (1933).

Psychol. Rev. 36, 56–76 (1923), especially Fig. 1, p. 59.

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