Abstract

A 4° square, two-part photometric field, symmetrical about a vertical division and viewed through a pupil 3 mm in diameter, is illuminated in both parts by artificial sunlight at a constant brightness of about 3 or 4 millilamberts (retinal illumination, 70 to 90 photons) with a surrounding field of about 0.5 millilambert. Homogeneous light is added to one-half, and sunlight simultaneously subtracted so that the field remains matched in brightness. Two adjustments of the mixture are made: (1) the least purity perceptible with certainty (pmax), and (2) the greatest imperceptible purity (pmin). The purity of these mixtures is then measured, increased accuracy being obtained by measuring a known large multiple of the homogeneous brightness. Values of pmax and pmin have been obtained as a function of the wave-length of the homogeneous component; these values are reported in detail, and some discussion of their interpretation is given.

© 1938 Optical Society of America

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References

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  1. Irwin G. Priest, “The Spectral Distribution of Energy Required to Evoke the Gray Sensation,” Nat. Bur. Stand. Sci. Pap. 17, 231 (1922); S417. See Appendix, p. 260.
    [Crossref]
  2. For a definition of colorimetric purity see Irwin G. Priest, “Apparatus for the Determination of Color in Terms of Dominant Wave-Length, Purity and Brightness,” J. Opt. Soc. Am. and Rev. Sci. Inst. 8, 173 (1924); Irwin G. Priest, “The Computation of Colorimetric Purity,” J. Opt. Soc. Am. and Rev. Sci. Inst. 9, 503 (1924).
    [Crossref]
  3. R. Davis, “A Correlated Color Temperature for Illuminants,” Nat. Bur. Stand. J. Research 7, 659 (1931) RP365.
  4. Irwin G. Priest, “A Precision Method for Producing Artificial Daylight,” Phys. Rev. 11, 502 (1918); J. Opt. Soc. Am. and Rev. Sci. Inst. 12, 479 (1926). D. B. Judd, “Reduction of Data on Mixture of Color Stimuli,” Nat. Bur. Stand. J. Research 4, 525 (1930) RP163.
  5. Irwin G. Priest, “Apparatus for the Determination of Color in Terms of Dominant Wave-Length, Purity and Brightness,” J. Opt. Soc. Am. and Rev. Sci. Inst. 8, 173 (1924).
    [Crossref]
  6. D. B. Judd, “Sensibility to Color-Temperature Change as a Function of Temperature,” J. Opt. Soc. Am. 23, 7 (1933).
    [Crossref]
  7. K. S. Gibson and E. P. T. Tyndall, “The Visibility of Radiant Energy,” Nat. Bur. Stand. Sci. Pap. 19, 131 (1923–24) S475. Proceedings International Commission on Illumination, 6th Meeting, Geneva (University Press, Cambridge, England, 1926), pp. 67, 232.
    [Crossref]
  8. See, for example, D. B. Judd, “Precision of Color Temperature Measurements under Various Observing Conditions; a New Color Comparator for Incandescent Lamps,” Nat. Bur. Stand. J. Research 5, 1164 (1930); RP252.
  9. L. A. Jones and E. M. Lowry, “Retinal Sensibility to Saturation Differences,” J. Opt. Soc. Am. and Rev. Sci. Inst. 13, 25 (1926).
    [Crossref]
  10. D. McL. Purdy, “On the Saturations and Chromatic Thresholds of the Spectral Colours,” Brit. J. Psych. (Gen. Sec.) 21, 283 (1931).
  11. L. C. Martin, F. L. Warburton, and W. J. Morgan, “Determination of the Sensitiveness of the Eye to Differences in the Saturation of Colours,” Medical Research Council, , Special Report Series, No. 188, London, 1933.
  12. W. D. Wright and F. H. G. Pitt, “The Saturation-Discrimination of Two Trichromats,” Proc. Phys. Soc. 49, 329 (1937).
    [Crossref]
  13. Martin, Warburton, and Morgan (see reference 11) give a discussion of possible sources of unreliability of the Jones-Lowry data. See, also, D. B. Judd, “Chromaticity Sensibility to Stimulus Differences,” J. Opt. Soc. Am. 22, 95 (1932).
    [Crossref]
  14. Selig Hecht, “The Development of Thomas Young’s Theory of Color Vision,” J. Opt. Soc. Am. 20, 231 (1930). The tentative theoretical curves in this paper do not completely harmonize mixture data for the normal eye with the Priest-Brickwedde data; consult D. B. Judd, “The Mixture Data Embodied in the Tentative Curves of Hecht’s Theory of Vision,” J. Opt. Soc. Am. 20, 647 (1930); this deviation has been taken care of in Hecht’s subsequent formulation of Young’s idea.
    [Crossref]
  15. Selig Hecht, “The Interrelation of Various Aspects of Color Vision,” J. Opt. Soc. Am. 21, 615 (1931); “A Quantitative Formulation of Colour-Vision,” Report of a Joint Discussion of Vision, The Physical and Optical Societies, June1932; “The Retinal Processes Concerned with Visual Acuity and Color Vision,” , Howe Laboratory of Ophthalmology, Harvard Medical School, Harvard University Press, Cambridge, August1931.
    [Crossref]
  16. D. B. Judd, “Chromaticity Sensibility to Stimulus Differences” J. Opt. Soc. Am. 22, 72 (1932).
    [Crossref]
  17. D. B. Judd, “A Maxwell Triangle Yielding Uniform Chromaticity Scales,” Nat. Bur. Stand. J. Research 14, 41 (1935) RP756; also J. Opt. Soc. Am. 25, 24 (1935).
    [Crossref]
  18. See, for example, J. F. Schouten, “Grundlagen einer quantitativen Vierfarbentheorie. I,” Proc. Koninklijke Akad. v. Wetenschappen, Amsterdam,  38, No. 6 (1935). Schouten, like Hecht, has shown an approximate correspondence between mixture data for the normal eye and the Priest-Brickwedde data by resort to a certain form of visual theory.
  19. I. G. Priest and F. G. Brickwedde, “The Minimum Perceptible Colorimetric Purity as a Function of Dominant Wave-Length with Sunlight as Neutral Standard,” J. Opt. Soc. Am. and Rev. Sci. Inst. 13, 306 (1926).
  20. D. B. Judd, “A Method for Determining Whiteness of Paper,” Paper Trade J., Tech. Sec. 100, 266 (1935); Paper Trade J., Tech. Sec. 103, 154 (1936); also Tech. Assoc. Papers, Series 18, 392 (1935); Series 19, 359 (1936). H. J. McNicholas, “Color and Spectral Transmittance of Vegetable Oils,” Nat. Bur. Stand. J. Research 15, 99 (1935) RP815; also Oil and Soap 12, 167 (1935). D. B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 ICI Colorimetric Coordinate System,” Nat. Bur. Stand. J. Research 17, 771 (1936) RP944; also J. Opt. Soc. Soc. Am. 26, 421 (1936). H. J. McNicholas, “Selection of Colors for Signal Lights,” Nat. Bur. Stand. J. Research 17, 955 (1936) RP956. D. B. Judd, “Surface Color,” J. Opt. Soc. Am. 25, 44 (1935). F. C. Breckenridge and W. R. Schaub, “Rectangular Uniform-Chromaticity-Scale Coordinates,” J. Opt. Soc. Am. 27, 226 (1937). D. L. MacAdam, “Projective Transformations of I.C.I. Color Specifications,” J. Opt. Soc. Am. 27, 294 (1937).
    [Crossref]

1937 (1)

W. D. Wright and F. H. G. Pitt, “The Saturation-Discrimination of Two Trichromats,” Proc. Phys. Soc. 49, 329 (1937).
[Crossref]

1935 (3)

D. B. Judd, “A Maxwell Triangle Yielding Uniform Chromaticity Scales,” Nat. Bur. Stand. J. Research 14, 41 (1935) RP756; also J. Opt. Soc. Am. 25, 24 (1935).
[Crossref]

See, for example, J. F. Schouten, “Grundlagen einer quantitativen Vierfarbentheorie. I,” Proc. Koninklijke Akad. v. Wetenschappen, Amsterdam,  38, No. 6 (1935). Schouten, like Hecht, has shown an approximate correspondence between mixture data for the normal eye and the Priest-Brickwedde data by resort to a certain form of visual theory.

D. B. Judd, “A Method for Determining Whiteness of Paper,” Paper Trade J., Tech. Sec. 100, 266 (1935); Paper Trade J., Tech. Sec. 103, 154 (1936); also Tech. Assoc. Papers, Series 18, 392 (1935); Series 19, 359 (1936). H. J. McNicholas, “Color and Spectral Transmittance of Vegetable Oils,” Nat. Bur. Stand. J. Research 15, 99 (1935) RP815; also Oil and Soap 12, 167 (1935). D. B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 ICI Colorimetric Coordinate System,” Nat. Bur. Stand. J. Research 17, 771 (1936) RP944; also J. Opt. Soc. Soc. Am. 26, 421 (1936). H. J. McNicholas, “Selection of Colors for Signal Lights,” Nat. Bur. Stand. J. Research 17, 955 (1936) RP956. D. B. Judd, “Surface Color,” J. Opt. Soc. Am. 25, 44 (1935). F. C. Breckenridge and W. R. Schaub, “Rectangular Uniform-Chromaticity-Scale Coordinates,” J. Opt. Soc. Am. 27, 226 (1937). D. L. MacAdam, “Projective Transformations of I.C.I. Color Specifications,” J. Opt. Soc. Am. 27, 294 (1937).
[Crossref]

1933 (1)

1932 (1)

1931 (3)

1930 (2)

1926 (2)

I. G. Priest and F. G. Brickwedde, “The Minimum Perceptible Colorimetric Purity as a Function of Dominant Wave-Length with Sunlight as Neutral Standard,” J. Opt. Soc. Am. and Rev. Sci. Inst. 13, 306 (1926).

L. A. Jones and E. M. Lowry, “Retinal Sensibility to Saturation Differences,” J. Opt. Soc. Am. and Rev. Sci. Inst. 13, 25 (1926).
[Crossref]

1924 (2)

Irwin G. Priest, “Apparatus for the Determination of Color in Terms of Dominant Wave-Length, Purity and Brightness,” J. Opt. Soc. Am. and Rev. Sci. Inst. 8, 173 (1924).
[Crossref]

For a definition of colorimetric purity see Irwin G. Priest, “Apparatus for the Determination of Color in Terms of Dominant Wave-Length, Purity and Brightness,” J. Opt. Soc. Am. and Rev. Sci. Inst. 8, 173 (1924); Irwin G. Priest, “The Computation of Colorimetric Purity,” J. Opt. Soc. Am. and Rev. Sci. Inst. 9, 503 (1924).
[Crossref]

1922 (1)

Irwin G. Priest, “The Spectral Distribution of Energy Required to Evoke the Gray Sensation,” Nat. Bur. Stand. Sci. Pap. 17, 231 (1922); S417. See Appendix, p. 260.
[Crossref]

1918 (1)

Irwin G. Priest, “A Precision Method for Producing Artificial Daylight,” Phys. Rev. 11, 502 (1918); J. Opt. Soc. Am. and Rev. Sci. Inst. 12, 479 (1926). D. B. Judd, “Reduction of Data on Mixture of Color Stimuli,” Nat. Bur. Stand. J. Research 4, 525 (1930) RP163.

Brickwedde, F. G.

I. G. Priest and F. G. Brickwedde, “The Minimum Perceptible Colorimetric Purity as a Function of Dominant Wave-Length with Sunlight as Neutral Standard,” J. Opt. Soc. Am. and Rev. Sci. Inst. 13, 306 (1926).

Davis, R.

R. Davis, “A Correlated Color Temperature for Illuminants,” Nat. Bur. Stand. J. Research 7, 659 (1931) RP365.

Gibson, K. S.

K. S. Gibson and E. P. T. Tyndall, “The Visibility of Radiant Energy,” Nat. Bur. Stand. Sci. Pap. 19, 131 (1923–24) S475. Proceedings International Commission on Illumination, 6th Meeting, Geneva (University Press, Cambridge, England, 1926), pp. 67, 232.
[Crossref]

Hecht, Selig

Jones, L. A.

L. A. Jones and E. M. Lowry, “Retinal Sensibility to Saturation Differences,” J. Opt. Soc. Am. and Rev. Sci. Inst. 13, 25 (1926).
[Crossref]

Judd, D. B.

D. B. Judd, “A Method for Determining Whiteness of Paper,” Paper Trade J., Tech. Sec. 100, 266 (1935); Paper Trade J., Tech. Sec. 103, 154 (1936); also Tech. Assoc. Papers, Series 18, 392 (1935); Series 19, 359 (1936). H. J. McNicholas, “Color and Spectral Transmittance of Vegetable Oils,” Nat. Bur. Stand. J. Research 15, 99 (1935) RP815; also Oil and Soap 12, 167 (1935). D. B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 ICI Colorimetric Coordinate System,” Nat. Bur. Stand. J. Research 17, 771 (1936) RP944; also J. Opt. Soc. Soc. Am. 26, 421 (1936). H. J. McNicholas, “Selection of Colors for Signal Lights,” Nat. Bur. Stand. J. Research 17, 955 (1936) RP956. D. B. Judd, “Surface Color,” J. Opt. Soc. Am. 25, 44 (1935). F. C. Breckenridge and W. R. Schaub, “Rectangular Uniform-Chromaticity-Scale Coordinates,” J. Opt. Soc. Am. 27, 226 (1937). D. L. MacAdam, “Projective Transformations of I.C.I. Color Specifications,” J. Opt. Soc. Am. 27, 294 (1937).
[Crossref]

D. B. Judd, “A Maxwell Triangle Yielding Uniform Chromaticity Scales,” Nat. Bur. Stand. J. Research 14, 41 (1935) RP756; also J. Opt. Soc. Am. 25, 24 (1935).
[Crossref]

D. B. Judd, “Sensibility to Color-Temperature Change as a Function of Temperature,” J. Opt. Soc. Am. 23, 7 (1933).
[Crossref]

D. B. Judd, “Chromaticity Sensibility to Stimulus Differences” J. Opt. Soc. Am. 22, 72 (1932).
[Crossref]

See, for example, D. B. Judd, “Precision of Color Temperature Measurements under Various Observing Conditions; a New Color Comparator for Incandescent Lamps,” Nat. Bur. Stand. J. Research 5, 1164 (1930); RP252.

Lowry, E. M.

L. A. Jones and E. M. Lowry, “Retinal Sensibility to Saturation Differences,” J. Opt. Soc. Am. and Rev. Sci. Inst. 13, 25 (1926).
[Crossref]

Martin,

Martin, Warburton, and Morgan (see reference 11) give a discussion of possible sources of unreliability of the Jones-Lowry data. See, also, D. B. Judd, “Chromaticity Sensibility to Stimulus Differences,” J. Opt. Soc. Am. 22, 95 (1932).
[Crossref]

Martin, L. C.

L. C. Martin, F. L. Warburton, and W. J. Morgan, “Determination of the Sensitiveness of the Eye to Differences in the Saturation of Colours,” Medical Research Council, , Special Report Series, No. 188, London, 1933.

Morgan,

Martin, Warburton, and Morgan (see reference 11) give a discussion of possible sources of unreliability of the Jones-Lowry data. See, also, D. B. Judd, “Chromaticity Sensibility to Stimulus Differences,” J. Opt. Soc. Am. 22, 95 (1932).
[Crossref]

Morgan, W. J.

L. C. Martin, F. L. Warburton, and W. J. Morgan, “Determination of the Sensitiveness of the Eye to Differences in the Saturation of Colours,” Medical Research Council, , Special Report Series, No. 188, London, 1933.

Pitt, F. H. G.

W. D. Wright and F. H. G. Pitt, “The Saturation-Discrimination of Two Trichromats,” Proc. Phys. Soc. 49, 329 (1937).
[Crossref]

Priest, I. G.

I. G. Priest and F. G. Brickwedde, “The Minimum Perceptible Colorimetric Purity as a Function of Dominant Wave-Length with Sunlight as Neutral Standard,” J. Opt. Soc. Am. and Rev. Sci. Inst. 13, 306 (1926).

Priest, Irwin G.

For a definition of colorimetric purity see Irwin G. Priest, “Apparatus for the Determination of Color in Terms of Dominant Wave-Length, Purity and Brightness,” J. Opt. Soc. Am. and Rev. Sci. Inst. 8, 173 (1924); Irwin G. Priest, “The Computation of Colorimetric Purity,” J. Opt. Soc. Am. and Rev. Sci. Inst. 9, 503 (1924).
[Crossref]

Irwin G. Priest, “Apparatus for the Determination of Color in Terms of Dominant Wave-Length, Purity and Brightness,” J. Opt. Soc. Am. and Rev. Sci. Inst. 8, 173 (1924).
[Crossref]

Irwin G. Priest, “The Spectral Distribution of Energy Required to Evoke the Gray Sensation,” Nat. Bur. Stand. Sci. Pap. 17, 231 (1922); S417. See Appendix, p. 260.
[Crossref]

Irwin G. Priest, “A Precision Method for Producing Artificial Daylight,” Phys. Rev. 11, 502 (1918); J. Opt. Soc. Am. and Rev. Sci. Inst. 12, 479 (1926). D. B. Judd, “Reduction of Data on Mixture of Color Stimuli,” Nat. Bur. Stand. J. Research 4, 525 (1930) RP163.

Purdy, D. McL.

D. McL. Purdy, “On the Saturations and Chromatic Thresholds of the Spectral Colours,” Brit. J. Psych. (Gen. Sec.) 21, 283 (1931).

Schouten, J. F.

See, for example, J. F. Schouten, “Grundlagen einer quantitativen Vierfarbentheorie. I,” Proc. Koninklijke Akad. v. Wetenschappen, Amsterdam,  38, No. 6 (1935). Schouten, like Hecht, has shown an approximate correspondence between mixture data for the normal eye and the Priest-Brickwedde data by resort to a certain form of visual theory.

Tyndall, E. P. T.

K. S. Gibson and E. P. T. Tyndall, “The Visibility of Radiant Energy,” Nat. Bur. Stand. Sci. Pap. 19, 131 (1923–24) S475. Proceedings International Commission on Illumination, 6th Meeting, Geneva (University Press, Cambridge, England, 1926), pp. 67, 232.
[Crossref]

Warburton,

Martin, Warburton, and Morgan (see reference 11) give a discussion of possible sources of unreliability of the Jones-Lowry data. See, also, D. B. Judd, “Chromaticity Sensibility to Stimulus Differences,” J. Opt. Soc. Am. 22, 95 (1932).
[Crossref]

Warburton, F. L.

L. C. Martin, F. L. Warburton, and W. J. Morgan, “Determination of the Sensitiveness of the Eye to Differences in the Saturation of Colours,” Medical Research Council, , Special Report Series, No. 188, London, 1933.

Wright, W. D.

W. D. Wright and F. H. G. Pitt, “The Saturation-Discrimination of Two Trichromats,” Proc. Phys. Soc. 49, 329 (1937).
[Crossref]

Brit. J. Psych. (Gen. Sec.) (1)

D. McL. Purdy, “On the Saturations and Chromatic Thresholds of the Spectral Colours,” Brit. J. Psych. (Gen. Sec.) 21, 283 (1931).

J. Opt. Soc. Am. (4)

J. Opt. Soc. Am. and Rev. Sci. Inst. (4)

L. A. Jones and E. M. Lowry, “Retinal Sensibility to Saturation Differences,” J. Opt. Soc. Am. and Rev. Sci. Inst. 13, 25 (1926).
[Crossref]

For a definition of colorimetric purity see Irwin G. Priest, “Apparatus for the Determination of Color in Terms of Dominant Wave-Length, Purity and Brightness,” J. Opt. Soc. Am. and Rev. Sci. Inst. 8, 173 (1924); Irwin G. Priest, “The Computation of Colorimetric Purity,” J. Opt. Soc. Am. and Rev. Sci. Inst. 9, 503 (1924).
[Crossref]

Irwin G. Priest, “Apparatus for the Determination of Color in Terms of Dominant Wave-Length, Purity and Brightness,” J. Opt. Soc. Am. and Rev. Sci. Inst. 8, 173 (1924).
[Crossref]

I. G. Priest and F. G. Brickwedde, “The Minimum Perceptible Colorimetric Purity as a Function of Dominant Wave-Length with Sunlight as Neutral Standard,” J. Opt. Soc. Am. and Rev. Sci. Inst. 13, 306 (1926).

Nat. Bur. Stand. J. Research (3)

R. Davis, “A Correlated Color Temperature for Illuminants,” Nat. Bur. Stand. J. Research 7, 659 (1931) RP365.

See, for example, D. B. Judd, “Precision of Color Temperature Measurements under Various Observing Conditions; a New Color Comparator for Incandescent Lamps,” Nat. Bur. Stand. J. Research 5, 1164 (1930); RP252.

D. B. Judd, “A Maxwell Triangle Yielding Uniform Chromaticity Scales,” Nat. Bur. Stand. J. Research 14, 41 (1935) RP756; also J. Opt. Soc. Am. 25, 24 (1935).
[Crossref]

Nat. Bur. Stand. Sci. Pap. (2)

K. S. Gibson and E. P. T. Tyndall, “The Visibility of Radiant Energy,” Nat. Bur. Stand. Sci. Pap. 19, 131 (1923–24) S475. Proceedings International Commission on Illumination, 6th Meeting, Geneva (University Press, Cambridge, England, 1926), pp. 67, 232.
[Crossref]

Irwin G. Priest, “The Spectral Distribution of Energy Required to Evoke the Gray Sensation,” Nat. Bur. Stand. Sci. Pap. 17, 231 (1922); S417. See Appendix, p. 260.
[Crossref]

Paper Trade J., Tech. Sec. (1)

D. B. Judd, “A Method for Determining Whiteness of Paper,” Paper Trade J., Tech. Sec. 100, 266 (1935); Paper Trade J., Tech. Sec. 103, 154 (1936); also Tech. Assoc. Papers, Series 18, 392 (1935); Series 19, 359 (1936). H. J. McNicholas, “Color and Spectral Transmittance of Vegetable Oils,” Nat. Bur. Stand. J. Research 15, 99 (1935) RP815; also Oil and Soap 12, 167 (1935). D. B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 ICI Colorimetric Coordinate System,” Nat. Bur. Stand. J. Research 17, 771 (1936) RP944; also J. Opt. Soc. Soc. Am. 26, 421 (1936). H. J. McNicholas, “Selection of Colors for Signal Lights,” Nat. Bur. Stand. J. Research 17, 955 (1936) RP956. D. B. Judd, “Surface Color,” J. Opt. Soc. Am. 25, 44 (1935). F. C. Breckenridge and W. R. Schaub, “Rectangular Uniform-Chromaticity-Scale Coordinates,” J. Opt. Soc. Am. 27, 226 (1937). D. L. MacAdam, “Projective Transformations of I.C.I. Color Specifications,” J. Opt. Soc. Am. 27, 294 (1937).
[Crossref]

Phys. Rev. (1)

Irwin G. Priest, “A Precision Method for Producing Artificial Daylight,” Phys. Rev. 11, 502 (1918); J. Opt. Soc. Am. and Rev. Sci. Inst. 12, 479 (1926). D. B. Judd, “Reduction of Data on Mixture of Color Stimuli,” Nat. Bur. Stand. J. Research 4, 525 (1930) RP163.

Proc. Koninklijke Akad. v. Wetenschappen, Amsterdam (1)

See, for example, J. F. Schouten, “Grundlagen einer quantitativen Vierfarbentheorie. I,” Proc. Koninklijke Akad. v. Wetenschappen, Amsterdam,  38, No. 6 (1935). Schouten, like Hecht, has shown an approximate correspondence between mixture data for the normal eye and the Priest-Brickwedde data by resort to a certain form of visual theory.

Proc. Phys. Soc. (1)

W. D. Wright and F. H. G. Pitt, “The Saturation-Discrimination of Two Trichromats,” Proc. Phys. Soc. 49, 329 (1937).
[Crossref]

Other (2)

Martin, Warburton, and Morgan (see reference 11) give a discussion of possible sources of unreliability of the Jones-Lowry data. See, also, D. B. Judd, “Chromaticity Sensibility to Stimulus Differences,” J. Opt. Soc. Am. 22, 95 (1932).
[Crossref]

L. C. Martin, F. L. Warburton, and W. J. Morgan, “Determination of the Sensitiveness of the Eye to Differences in the Saturation of Colours,” Medical Research Council, , Special Report Series, No. 188, London, 1933.

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Figures (3)

Fig. 1
Fig. 1

Individual observations of minimum perceptible colorimetric purity (observer IGP), mixture analyzed by flicker method.

Fig. 2
Fig. 2

Individual observations of minimum perceptible colorimetric purity (observer FGB), mixture analyzed by flicker method.

Fig. 3
Fig. 3

Minimum perceptible colorimetric purity, average results of Priest and Brickwedde.