Abstract

The standard procedure of calibrating the Donaldson six-primary colorimeter is reviewed critically and some sources of systematic errors which might affect the accuracy of the calibration are discussed. In particular, the effect of the temperature variations of the primary filters and the nonuniform spectral transmittances of certain optical components of the instrument are studied. A way is described which leads to an improved calibration accuracy.

© 1964 Optical Society of America

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References

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  1. R. Donaldson, Proc. Phys. Soc. (London) 59, 554 (1947).
    [Crossref]
  2. W. S. Stiles and G. Wyszecki, J. Opt. Soc. Am. 52, 58 (1962).
    [Crossref]
  3. Y. Nayatani and G. Wyszecki, J. Opt. Soc. Am. 53, 626 (1963).
    [Crossref]
  4. Y. Nayatani and G. Wyszecki, J. Opt. Soc. Am. 53, 744 (1963).
    [Crossref]
  5. G. Wyszecki, J. Opt. Soc. Am. 50, 992 (1960).
    [Crossref]
  6. G. Wyszecki, J. Opt. Soc. Am. 49, 389 (1959).
    [Crossref]
  7. W. S. Stiles and G. Wyszecki, J. Opt. Soc. Am. 52, 313 (1962).
    [Crossref]
  8. D. B. Judd and G. Wyszecki, Color in Business, Science, and Industry (John Wiley & Sons, Inc., New York, 1963), 2nd ed.
  9. Colorimetry Report W-1.3.1, CIE Proceedings (Brussels, 1959), Vol. A, p. 93;Central Bureau CIE, Publ. CIE No. 4, Paris, 1960.

1963 (2)

1962 (2)

1960 (1)

1959 (1)

1947 (1)

R. Donaldson, Proc. Phys. Soc. (London) 59, 554 (1947).
[Crossref]

J. Opt. Soc. Am. (6)

Proc. Phys. Soc. (London) (1)

R. Donaldson, Proc. Phys. Soc. (London) 59, 554 (1947).
[Crossref]

Other (2)

D. B. Judd and G. Wyszecki, Color in Business, Science, and Industry (John Wiley & Sons, Inc., New York, 1963), 2nd ed.

Colorimetry Report W-1.3.1, CIE Proceedings (Brussels, 1959), Vol. A, p. 93;Central Bureau CIE, Publ. CIE No. 4, Paris, 1960.

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Figures (3)

F. 1
F. 1

Schematic diagram of Donaldson six-primary colorimeter. S1: 500-W lamp; S2: 250-W lamp; PF: six primary filters; FF: front view of filter frame; R: red filter; G: green filter; B: blue filter; Or: orange filter; YG: yellow-green filter; BG: blue-green filter; S: shutters; C: condenser lens; W: entrance window; E: exit prism; VS: variable sector; RS: rotating sector; MgO: magnesium oxide comparison surface; T: test filter; PC: photometric cube; P: exit pupil; O: observer’s eye.

F. 2
F. 2

Relative spectral transmittance of optical path containing condenser lens and integrating sphere of Donaldson colorimeter (primary filters removed).

F. 3
F. 3

Portion of (x,y)-chromaticity diagram showing points representing chromaticity of test color as determined by: (i) spectrophotometry and computation (cross); (ii) visual matching in Donaldson colorimeter and use of corrected transformation equations (solid dot); (iii) visual matching but use of uncorrected transformation equations (open circle). The ellipse illustrates the uncertainty of chromaticity due to random errors in calibration of colorimeter. The dotted polygon illustrates the estimated region of uncertainty of the mean observed chromaticity (solid dot) of five trained observers.

Tables (1)

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Table I Chromacity coordinates for the primary colors.

Equations (2)

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α X = X 1 W 1 + X 2 W 2 + X 6 W 6 , α Y = Y 1 W 1 + Y 2 W 2 + Y 6 W 6 , α Z = Z 1 W 1 + Z 2 W 2 + Z 6 W 6 ,
X i = ( x i / y i ) Y i , Y i = Y i , Z i = ( z i / y i ) Y i , ( i = 1 to 6 )